Most of the free floated handguards mount on a specific barrel nut, so you will need to be able to remove/replace and retorque the barrel nut if you want to DIY the install. Not complicated, but requires a special tool. Specific tool may depend on the forend you pick.

IMHO, the PSA handguards are decent for the money, and not difficult to install. Midwest Industries are also good, but a bit more $$. You probably don't need one of the "tier 1" $300 handguards, but stay away from the cheapo eBay and Amazon stuff.