Unless you plan to do some EXTREME rock crawling, I'd use the money to pick up a decent floor jack. I can't imagine not owning a floor jack now that I've had one for 15 years. I own a hi-lift jack too, but have never used it with my jeep.
Most importantly, do not breathe the dust from the brakes. Use a brake cleaner that will wet down and remove the dust. I've never owned a brake tool to remove springs etc. and have done many brake jobs. I probably don't know what I'm missing without one, but it can sure be done. Digital camera comes in handy when you are taking the back brakes off. If not, jack stand it up and do like the guy above said about copying the left and right with each other. Remember, they will be oposites of each other.
Green 99 Sahara
OME 2.5", JKS Discos, 31" Dayton Timberline MT's
IPF/PIAA Headlight Conversion