Easy way:
buy finaplix-h or component-th
buy a conversion kit
read basskiller's "fina conversion"
there are about 3 easy methods on his website. There is a "crystal fina" method too that I use, but don't do it unless you've got the equipment and the know-how.
follow instructions
smile at your creation
If you want to use fina these days you either have to trust your dealer if he has some, or make it yourself.
It is STILL illegal to use fina... even if all you do is crush up the pellets and snort them (not that that does any good).
Also fina without test is a big mistake for most people. I only know a handful of people that say they are fine with just fina... and I know none of them personally.
Then again if you're fine with not being able to perform sexually for the duration of the cycle or if you happen to be one of the world's only bodybuilding priests... go for it.
Personally, I don't think I could ever bring myself to try just fina by itself. I'm a manwhore and I like it.
As far as "fina kits" go... they're just empty vials, a vial of solvent, and a vial of oil with some needles and cases. If you know what you're doing, what the solvents are, and where to look... you could build 10 "fina kits" yourself for the same price as one from popular fina kit websites.