2. Your in luck - if you wanna return to stock height, it's REALLY cheap for the parts. Just check out the for sale section of the forum and see if you can pick up some used stock springs. Or put up a thread asking to trade your springs for stock ones. Or just sell your current springs her on the forum, and then buy new stock ones from Dal. There really is alot of options here for you.
Do you have any idea's on what your current springs are?
3. This is not necesarily easy work though. The fronts will take you a few hours. However, the rears will take about 30 minutes max.