Hi N.,
First of all, congratulations on your decision to breastfeed! You'll be giving your child the very best, and it will help you to form and maintain a close bond with him or her.
I stayed home when my kids were infants, so I can't speak from personal experience, but I was a La Leche League Leader for six years (in another area) and can tap into a ton of insights gleaned from many others!
If I were you I would absolutely borrow the one your friend has to start, and this is why: breast pumps are such an individual matter of preference. What works well for one woman might not for the next. Many working moms swear by the double electric pumps (most hospitals have them for rent), but I have known some who preferred various hand pumps and occasionally even hand expression. So if you try this one and find it works for you - problem solved (even if you end up buying one of your own.) And if it doesn't, you've eliminated one at no cost to you.
You'll want to wait until breastfeeding is well established (about six weeks) before you think about pumping. But after that, experiment and see what works for you. Don't settle for anything uncomfortable or awkward.
As for the sanitation concern, just make sure the equipment is thoroughly cleaned and sterilized with hot soapy water and bleach solution (and thoroughly rinsed, of course!)
I believe there's a La Leche League group around here. If you haven't yet, try contacting them. Their Leader is sure to have more up-to-date suggestions, and will likely be able to put you in touch with other area moms who've been there! (The LLL International web site (www.llli.org) has a ton of good info)
Good luck!
P.S. I looked up the Wausau Leaders' names:
Melissa ###-###-#### & Alana ###-###-####