<< There is no way in hell you should use a $7 crimp tool. At that price, they are absolute crap. >>
Russ is absolutely right. If you you use crappy equipment you get no quality control. You end up with a cable that probably won't transfer at high data speeds as if you use quality equipment.
If you aren't running the cables through walls and terminating them you'll probably be better off buying the cables with ends on them. After you have put ends on all of the cables you will also have time into them.
If you are interested in how the network cables and networks work and are doing it for the education as well, then go for it and make the cable it's a good learning experience. If you do I would still recommend a good crimper $50+ if you want it done right.
Just my .02