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Myself, I like to use Save Edge Rasps, Hall drop blade hoof knives, and I have a pair of GE Nippers, but really, if you are a regular trimmer (which is the best way to be! Little and often trimming yeilds the best results) you shouldn't actually need to get any nippers at all. A hoof stand is nice too - I actually love these www.hoofjack.com
but they are expensive - I use a regular hoof stand that my dad actually made me, modelled after the Hoof Jack but not quite so refined :P
There are lots of sites out there to help you out, but keep in mind too that there is a big difference between "barefoot or Natural" trimming and a farrier's trim - the regular farrier (and I'm sure there are exceptions to the rule) does not trim the same way as a natural trimmer does, they are quite opposite.
Some of my favourite sites are www.easycareinc.com
these guys sell the best hoof boots in my opinion, and they have lots of barefoot info and links. www.ironfreehoof.com
is a good one too, lots of information and photos
The lifestyle of the horse is also crutial to your barefoot success - I do firmly believe that every horse can go barefoot, but not every owner can. You'll find lots on that as you read up too :) Best thing i did was put down lots of gravel around my horse's sheds, so that they can condition thier own feet to the terrain I ride on (quite rocky!)
I think it certainly is worth you purchasing the DVD - start just with the rasp, and if you are nervous about using the knife, I learned to cut properly on a potatoe - its got a similar consistency to dead sole and frog materials. Helps as you practice to make sure you are cutting straight and not "scooping" creating divets in your horse's hooves.
Lots of opinions out there - be prepared to have an open mind, but also to defend your reasonings. One of the worst things about my transition to barefoot was having so many people tell me "You can't" and trying to make me feel as if MY choice to look after MY horses was not correct.