You haven't even started yet.
A friend at another shop tried this on a Chinese Washburn a year or two ago. Took a few weeks to get through the work, which did not go as planned, then a few months and a few thousand dollars to get through the court system when the emotionally attached owner wasn't happy with the results. No joke.
It's not a serviceable neck joint. Best option with these is to burn them. Not worth the work to repair, and does not provide any useful experience to improve skills in relation to guitars that are worth working on if your main goal is to learn.
If it's just a spare time project that you're doing for fun, you can saw off the neck and convert it to a bolt on. Nothing under the 15th fret to steam but a chunk of wood.
! No room behind the joint, I was just about able to squeeze a razor blade in there, and just look at that hole on the treble side, that goes all the way down to the heel! Shimmed to buggery from the factory and off centre by a country mile. No wonder the neck angle is off! Really, I'm amazed it's lasted as long as it has.