I didn't convert mine, but I've heard folks say it's a 40 hour job. Most mechanics say two weeks for everything.
It could probably be done quickly. However, I promise you, proper alignment is EVERYTHING. You'll want a pussycat, not a jackrabbit.
Dan Meler said he knew his was going to head for the ditch on landing. He just didn't know WHICH ditch.
If you bought this kit, you could probably sell it for what you got in it. Surely minimizes your risk there.
Anyway, good luck with it if you decide to proceed.