Its simple. This is for spike 1 but the same for spike 2 more or less. To pop off the head disconnect about 6 connectors ( I think 2 from the power area and 4 from the main board, speaker connector too, and 2 ethernet cables. Make sure you mark the two ethernet cables as they must go back in the same spot on the main board in the head. Then you should then be able to pull the head harness into the cab. Then remove( either the 2 hinge bolts on the side ( harder to re-assmble (, or the 4 bolts in the head vertically mounted, easier). Then lift up head.
I also take out the playfield as it takes about 1 minute to disconnect a couple connectors in the cabinet. Do that and lift out. All the connectors are specific so you cant swap them accidentally. You might have to cut a zip tie or two to separate some of the cab and playfield wiring to pull out the playfield.
Good luck! You back will thank you!!