This is not an easy task but I like the VX soo much I deal with it.
I can help. I have a 6 week old and a 2- year old so I currently have a bucket-base (for travel system) and a car seat in my VX. Are you using a car seat or travel system base? is it going to be front or rear facing? (state laws differ)
For rear facing the best way thru the back. BASE INSTALLATION: Removing the headrest helps much just store them somewhere for now. Fold both seats towards the rear when installing. For tightening (it is tricky but I recommend a "mighty tight" $16 walmart) you will need one bath towel. Roll up the bath towel under the seat or base (towards rear) to level it. Tighten the seat belt as much as possible. You will notice that the seat (BASE) might not seem really tight with the seat back down but when you put the seat back up it pushes the child seat slightly forward and tightens it. If you have a infant carrier bucket I recommend installing it on the passenger side the carrier handle fits better when flipped down (recomended for safety). USAGE: To place the carrier into the VX open rear door (never have car running exhaust will enter car), Flip seat towards you and place carrier on base and make sure it locks in. Slide carrier handle forward (may need to kneel into VX), flip seat up. To remove carrier I have done it three ways: 1- open rear door flip both seats down crawl into car, pull base release and lift carrier out of base. You can leave the seats this way if the headrests are off otherwise you have to put the seats back up to close door. 2- from passengers side (outside of car) slide seat forward squeeze in and pull release and lift carrier out of base place carrier on drivers side seat slide passenger seat back take carrier out of car (you can install seat this way (reversing steps) it is just more difficult).
This was from an earlier post my boys are now 1 1/2 and 3 they are both are in car seats. It is easy for the 3 year old to crawl in but I still have to put the 1 1/2 year old into the seat behind the passenger seat almost crawling in to th VX to buckle him in. That is why we usually use the wife's minivan.
Good Luck!