Hi Annie, Welcome to the funny farm.
I did my seat, and several others. The best tool to use is an electric carving knife for cutting the foam. If you mess it up it is easy to find new foam at any upholstery shop.
When you staple it back use MONEL staples. They have them for any gun but Arrow is what I use. Monel will not rust. ever!
For the Var you can buy a cheepo on ebay that will last a short while or order a Jasil Top racing from spi or racing planet.
SPI has been giving dealer status to forum members making your cost about 45 bucks.
I have read this is over but I have not called them to confirm. I'm the guy that got that set up for forum members...
If you look around just google that var, and select the best price. They retail for 99.00 bucks US
I posted on the other thread to NEVER mix roller weights. The heavy ones do all the work, and the light one simply float.
If you weigh under 150 then 7 gram Dr Pulley sliders will work GREAT. Combine those with a Malossi RED control spring, and you have a winner. The control spring is the big spring under the clutch. That controls when/where the bike shifts up to higher ratios.
if you need help understanding all this...
The guy that made this vid is kind of "hacking" the job but the idea is there