I don't have any gunsmithing skills at all but followed the Brownell's video and then printed the pdf file to take into the garage with me. I changed the handguard on my Bushmaster carbine. Only real problem was one of the pins on the FSB. Finally, ground down and old punch and used a "BFH" to get it to move. Once the pin was out it took less than 30 min. Shot it this last weekend and everything works, so must have been a good install.
I did watch both videos a couple of times. Didn't have the receiver block but found a couple of boards and two c-clamps seemed to work just fine. Didn't warp anything and the barrel nut came loose without any problem.
I was rather proud of myself.