Interview several realtors to find out what they would do to sell your home. Do they stage it themselves, require you to pay for it or do they feel it is necessary in your area? I would start with realtors who have sold homes in your neighborhood and are familiar with all of the highlights of your neighborhood. How do they advertise? Are open houses effective in your neighborhood? Do they host a caravan of realtors that come through on a certain day of the week/month?
If you find a good, experienced realtor that does this as a full-time job, you can trust them to set pricing, negotiate, use creative selling incentives, etc. At the buying end, find a full-time realtor (with all those initials after their name) as well. You want someone who has sold many homes in the areas you are looking so they can tell you if a home is priced well and what is a good negotiating angle. (For example, they can push for a lower price because of the construction of the home or location, even if it is ideal to you.) They can negotiate on resale pros and cons.
When going through your stuff (start now), ask yourself if it is something you really want/need. Is it worth paying the weight and volume to move it? Is it worth having to find a new home for it in your new place? Don't think about what you paid for it. Most of your stuff has gotten its value if you have used it. If you haven't used it, just accept that it was a bad purchase and get rid of it. Plan on having a garage sale. Or if you don't have time, energy, desire, etc. to have a garage sale, start filling boxes to donate. Then every week, start taking stuff to the thrift store of your choice. Remind yourself that you are helping someone by donating your stuff.
Declutter your home. Keep an empty drawer in the kitchen or somewhere that you can quickly stash your mail or other daily clutter. Don't worry about strangers in your home. They must be accompanied by a realtor. If you are home when someone comes by to look, leave if you can. If you can't, go outside in the backyard so they have the freedom to really look around. You want them to look in your cleaned out closets, and decluttered pantry. You want them to spend a lot of time in your home, as they try to imagine themselves and their belongings in it.
Start packing some of your kids' toys. That can really clear up a lot of clutter in your home. Don't worry about your kids missing a particular toy. It will be all "new" and appealing when they unpack at the other end. It will be like they got a lot of new toys since they will not have played with them in a while. And once packed, it stays packed. They have plenty to play with. If they have lots of toys out when they play, put their toys in organizing bins so that they can have one or two bins out at a time. It will be easy to clean up if some buyers are coming by.
Once your house is on the market, make a plan to do a quick pick-up every time you leave the home. You will want it looking clutter-free when potential buyers come by.
When packing, use as many boxes that are the same size. They stack easier in a moving truck. You can get moving boxes sometimes on Craigslist for free. Do you know someone who moved recently? They might still have their boxes. Or you can purchase moving boxes online. There is a lot of stuff that can be packed now that you will not need. The more you can get out of your rooms and closets, the bigger they will look.
Ask your realtor if you need to paint, plant flowers, replace the front door hardware, remove extra furniture, etc. They know what makes a home look inviting and spacious. They know what kind of curb appeal will bring someone inside. Clean all the nooks and crannies. Repair anything that needs it. If your home looks clean and well-cared for, it is much more appealing.
Find a sitter for your kids on moving day. It is a long day and they will want your attention. You also don't want them getting run over by the movers.
Find ways to relax and get away from time to time. Moving is one of the major stressors in your life and you do not want to get in pointless arguments just because you are stressed. Don't expect your husband to feel the same kind of stress that you do. Everyone goes through the process differently. Just get away to the park with the kids for a few hours here and there. Or enjoy the quiet of the library and find new books. Plan ahead what works for you when you get stressed - a bath, some good music, some time to read a magazine, taking the kids for a walking adventure, etc. so you can drop what you are doing for a little break.
Can you tell I have moved a lot?