My first thought is "ha ha, no." I'm not trying to be rude or facetious, just that 14 years in, it's still a struggle sometimes. It's easier now that my sks are grown and their mother isn't much involved in anything. It's easier now that I have my own child to focus on (childless stepmothering is hard...esp. when you want your own kid like I did). It's easier now that DH sometimes sees things my way instead of just thinking I'm a lunatic. So yes...but no.
Regarding her behavior, teen girls can be rude. Teens are at an age where they want to be "all grown up" but at the same time, still need help. If you don't like her yelling, then talk to Rick and ask him to address it. If he runs ragged to try to accommodate her 24/7, then that's on him, but if it's affecting your relationship, you need to try to get him to see that you're not being mean, but that it is healthy for him to expect things of her. Like chores. It's normal if teens don't get reined in.
You might also ask for family or marital counseling or to attend a joint class on parenting teens together. I am not discounting your frustrations at all because having my stepson boomerang after college nearly did us in. DH even had a place to go and almost moved out. Kid behavior can break a marriage. If you are at a breaking point, he needs to know, and he needs to know in the context of you don't respect him when...and it may take a pro to help you and he communicate this. For a long time my DH felt (and still sometimes does, I think) that I was just hateful of his children. NO, stupid head, I don't like how they treat you or me or our child together. I don't like their disrespect of our home or time. And that is normal! People are blind to their own kids, especially if they feel guilty. My DH would be judgey about his nephews and I'd ask him, "So how is it different when your kids do the same thing??" It took us wasting money on a large rental house for my DH to see that it was OK to go on vacation without them, since they certainly didn't run their lives on his schedule. Etc. Your DH needs to remember he can say no, or "It's on the counter, please get it yourself. I am on the phone." Four year olds can learn not to bother people on the phone (and in fact teens are very much like toddlers, but bigger and mouthier.)
So bottom line is what can you deal with, what can't you deal with, can you make changes on your own (perhaps you and DH can study a book like How To Talk So Kids Will Listen) and what is a dealbreaker for your marriage. If my DH spent every other week catering to his DD (either of them, including ours together) at the detriment of our relationship, I'd be mad, too. Is she a guest or member of the family?
And for those who say "package deal", well, yeah. I knew he had kids. But I could not anticipate all the things that frustrated me over the years. I knew his ex was nutty, but didn't realize the full extent of her nutty behavior. I didn't anticipate his daughter doing things like giving her BF the key to our home and not telling us and then having him key into our home like he lived there. For example. Or his ex's legal b.s. He is STILL rescuing them from their own stupidity and it takes a lot of effort to let it go. And depending on the thing, letting go of things that genuinely hurt you or bother you for years and years wears on your soul. I lost a lot of respect for my DH when he would not stand up to his ex or his kids. It was a long road (is a long road) back. You don't know how deep the trenches til you are in them.