I’m trying to install an aftermarket radio, backup camera, etc. any feedback on how the hell I get my hand in there to unplug the wires from the amp to install the amp bypass? These trucks are a mess for an aftermarket radio.

 

All my experience with upgrades to Infinity system has involved removing the amp.
A couple of suggestions: Get some pliers on the black plugs and wiggle it some to loosen it, then pull it out with the pliers or by hand. Other option is to loosen the two front bolts holding the amp, then pivot the amp to give you better access to the plugs.
If you decide to remove the two front bolts, there's just one more in the back to remove and the amp comes out. The back bolt is the tricky one but I have heard of people having success on this bolt by using a ratcheting box wrench. All three bolts are 10mm.

 

Unbolt it.

 

I did and there is a bolt in the back too. Thinking I’d have to drop the AC system or rip the whole dash off the top to get to the other bolt.

 

I just got done doing this. My amp is completely out and I cut the wires and spliced them accordingly. You just have to configure up some sockets and different adapters to get to that last bolt. It was a pain but my new system is still needing some adjustments but it does work.

 

Don't cut the wires!

You can buy a bypass for the amp that plugs into the connectors from each side. I think I got mine from Crutchfield.

 

That one too, I KNOW that one is major b!tch too. Best thing I can tell you is be patient.