I am all for trying things on your own, BUT bending your own piping is difficult.
I'm not saying I'm an expert or anything but I did my true duals myself. Just orders 2 10' section of pipe, the mufflers, and had a harbor freight (I know I know lol) bender. Literally laid under the truck for a couple hours just trying to get my head around how to do the bends and what not.
Came out fine, sounds great, and I can now say I did it myself, but it was far from easy. And it took me about 4 days to get it done.
As other people say you can't make hard bends with the bender or it will fold the pipe. So you have to do gradual bends to get what you want. And you'll definitely need a second set of hands to wrangle the pipe around the bender.
My buddy went the other route and just went to a muffler shop and bough a bunch of 90's, 45's, and straight runs and did his exhaust like that. Both work but one has more welding.