subframe connector help

[pewterWS6-2000]

I picked up a set of weld in SFC's from Sphohn peformance and i am looking to get some better Installation instructions than the ones they gave me. Im not able to use a drive on lift so my garage is where its ganna happen. The part i dont understand is how to not build a twist in the car, because i pritty shure the car has to be somewhat level when you do this, right? Spohn says to place the front tires on ramps and jack the rear end up. I know the car's suspension would be at load at that point but i afraid that the car could be uneven when i weld the SFC's in.
I really dont wanna screw my car up so can someone please give a step by step procedure if possible. thanks

[2002WS6TransAmT56]

Having the front wheels on the ramps and the rear held up by jackstands is the same as it being on a lift, it will be fine. The suspension is still under the same load as it would be on a lift. Be sure to have the rear as high as the front if you want it to be perfectly level.