Turn your garage into a spray booth. I use plastic sheeting from lowes stapled to the ceiling, then screen door material covering the garage door opening and two fans for exhaust. Also make sure the floor is clean.
If you need to kill as much over spray as possible you can shut the garage to the top of the fans, then hang wet towels in front of them to catch the overspray. I prefer having the door open to let in more light and using the screen material to keep bugs etc out, but if you're in a neighborhood that may not be an option for you.
When I painted my 944 turbo I put it on jack stands to help me get the lower portion of the car.
As far as cheap paint for a BC/CC job....I've used PPG shopline, but really didn't like it much, so would suggest House of Kolor. It isn't the cheapest, but EXCELLENT paint for the money. As for clear I order from a place in Georgia called SPI. Decent prices and very good clear. I use the universal clear.
This place has good prices on HOK: http://www.coastairbrush.com/categories.asp?cat=44
SPI's website: http://www.southernpolyurethanes.com/index.htm
Isocyanates....yep nasty nasty stuff. I buy the dual filter painting masks at the local autobody store that specifically mentions protection against isocyanates and I use new filters with every paint job. I also tend to wear a headsock, painters jumpsuit, and gloves. Also, when I have to mix more paint I mix outside of the booth/room, so I'm not sitting in there with the chemicals as much.
Also, for BC/CC jobs you really don't want to go too cheap on the paint and clear. These days I'm either using tractor paint for a quick, single stage, (make this POS look better) type job or I'm using glasurit or HOK base with SPI clear for a pro level paint job. BC/CC is a lot more work, so if I'm going to invest the time I try not to cheap out on materials too much. Good luck!
Edit: Another thing to think about. If the car is in pretty good shape minus the places with clearcoat issues you can always reclear just those areas. The downside is the paint will look fresh there and older everywhere else. I did this on my suburban because the clear on the hood and roof was in bad shape. I sanded the dead clear off and sprayed fresh clear and those areas looked much better, but really too good compared to the rest of the truck. I've thought about trying a low gloss clear for areas like that in the future, to try and match the old clear better, but have not had a chance yet.