Anytime you do something first it’s a challenge but these cars are pretty forgiving and so are the members.
One thing I would say from your pictures is give that engine bay a good cleaning you’d be surprised some the other things that need attention when you do.
And as Christuna said don’t touch the tranny no matter how tempting it is until the engine is right, it’s like when mom said “Stop scratching it it’ll get infected” but you couldn’t help yourself right.

When I did mine I received great help here and some of guys sent me pictures they dug up saying Oh I forgot I had these snap-pies.
It’s a tight spot to work and your gonna which you had that third �� ✋ ✋ but you can always count on the help hear.
I believe when I did it spent $40 for switch and $12 for the lock key.
Keep coming back with questions a pictures this forum never let me down .
greazer2b