Forget the lift, the pulley kit install is a no-brainer and can be done top-side. No need to remove the under-engine cover either. Here are the basic steps...I just did mine a couple of weekends ago.
1. Open hood
2. Unbolt black metal panel covering the radiator and a/c condenser (the hood latches are also bolted to this.)
3. Unscrew the black plastic cover that holds and fastens the radiator shroud, radiator and a/c condenser together
4. Look to both sides of the radiator shround, on the fan-side, you will see wings that fold away towards the engine. Pry this with a large flat screwdriver, it will snap and fold 90 degrees, out of the way of the radiator hoses, and you can lift the radiator shroud/fan assembly - don't forget to disconnect the electrical plugs - out of the way. No need whatsoever to disconnect the radiator hoses.
5. After removing the radiator shroud and fan assembly, you have a clear view and all kinds of space to work.
6. Remove the covers to the 3 tensioner pulleys.
7. Compress the left tensioner pulley to remove the outer belt.
8. Unbolt the middle tensioner pulley so you can remove the inner belt.
9. Compress the right tensioner pullet to remove the inner belt.
10. Remove the 6 bolts holding the crank pulley
That's it. Installation is the reversal. The main crank pulley cover will probably be larger than the smaller pulley you are installing. It took me an hour to grind the pulley cover to get it to fit into the new pulley. I tried to take some pics, I will look for them when I get home from work today and post some, should help you. Not counting the time it takes to grind the crank pulley cover, the whole job will take an hour. For reals!!!!
But yeah, installing the pulley kit from the underside is a PITA and a nightmare, I wouldn't recommend it...regardless of what the RPI instructions say - no disrepect to them. They have great products - I use their pulley kit, oil cooler and scoops.