rear suspension upgrades
 

After installing new upper and lower controll arms whats the proper way to tighten everything down. I assume with all the bolts slightly tightend rest the rear back on the wheels then tighten everything up. Is there anything else I should look out for?

Thanks!

Yes, basically thats it.
When you raise the car, lift it by the axle and front control arms (suspension loaded). That way you can crawl under there and tighten everything, while car is resting with suspension loaded (simulate on-ground).