Greg did his TKO swap a couple of years ago. I converted to the TKX late last year, and the prices went up, and the kit didn't include the driveshaft, which the earlier kits did. That's an additional $300.
The tunnel will require a doghouse to cover the shifter mechanism, so you either have to weld or buy panel bond to adhere it to the tunnel.
If your car was originally an auto on the tree, there's the expense converting the steering column to manual. There are manual collars that can be purchased and swapped over, but they're hard to find and pricey. I'm going to pull the existing column and convert it to manual. The cost will be in a cutting wheel, JB Weld, bondo, and paint.
It's an expensive and time consuming project, but worth it. Going from a 3,000 stall converter to a manual trans is life altering. (Maybe a little over-dramatizing)