Are you wanting to convert to 5-lug or stay 6-lug?
I'm not sure you'll save money doing it on your own, though you might. The advantage to doing it yourself is you know what parts you used.
I bought a bracket kit when I did mine and converted to 5-lug as I did it. It included caliper brackets, a spacer for the inside bearing, the inner bearing and seal and little else. This was 7 years ago so my memory for details could be fuzzy.
My kit called for mid-70's GM mid-size car disks and calipers. I was parting out a '73 Chevelle wagon at the time so I choose that car as my parts source, then bought all the pieces new to fit it.
You really need to swap to a dual master at the same time, and replumb the brakes to support that.
I bought parts from Chevy Duty (since changed names) and was not impressed by them, CPP which I was pleased with, Eastwood (brake line tools) and two of my local auto parts stores.
I spent $700 or so back in 2002.
You can make your own bracket and spacer, though for the $100 or so I'd suggest you just buy the kit.
The six lug kits usually retain the stock hub and mount a disk on it, so bearing changes are not required though many suggest it.
