Compressors and tool kits are best left to experienced mechanics who know the approximate amount of force to apply to each different bolt on the car. E.g. Each bolt on the car has different tolerances and re-torque specifications. You could either break a bolt causing it be stuck, or not tightening it enough for road use.. (correct me if i'm wrong.. but u can't measure torque on a air gun or whatever u call it)

p.s: Not implying that anyone don't have the experience.. some people do..