Not sure if anyone has written a tutorial (probably exists) but at least let me get you inside the machine.
Put the key in the lock on the coin door on the front of the game, unlock door. Confirm they have the key ahead of time- No Key? Search the forum for what to do. Or bring the universal key set (Drill and a selection of sharp bits-guts of the lock are brass)
Open door. Inside the door frame, upper right area, is a spring loaded lever. Pull it and it and it unlatches the lock bar (where your hands rest when playing).
Lift off the lock bar, it may take a bit of fiddling, but you should not need tools. Put lock bar somewhere safe.
Stand in front of game, place palms on glass and pull towards yourself- glass should start to slide out. When close to 1/2 out, move hands to edges of glass, hold tight and continue to slide out. It's heavy and awkward. Place the glass somewhere safe, leaning against something solid. Cushion the floor where the glass rests- NEVER put that glass edge directly on concrete.
Get all the balls out - reach inside and find the lever that puts the balls into the shooter lane. Move it by hand, and as the balls appear, remove them, and store safely.
All balls out, put fingers of one hand under the apron and lift gently. It's heavy. When the edge is up above the cabinet, grab the front of the playfield with the other hand. You may have to hold that spring loaded lever out while starting to lift - I can't remember.
Lift the playfield to about 60 degrees, hold up w/ left hand. Reach inside cabinet on right side and swing prop stick up. Put tip of prop into countersink in underside of play field to hold up playfield. Be sure all is stable before letting go.
If you have the headroom, you can ignore the prop; carefully pull the playfield towards you about 6 inches or so, and swing the playfield all the way up until the playfield is resting against the top of the backbox. Make sure it is stable- pull the playfield a little further out if the playfield is too 'straight up and down' so that it is leaning securely back against the top of the backbox.
Reassembly is the reverse. You may have to hold the spring loaded lever to get the playfield all the way down, and i know you must hold the spring loaded lever to re-insert the lock bar. Put the balls back in!
It's a good game, considered by some to be too simple for serious players long term in a small collection. I suck at playing so i can't beat it consistently, and I have 18 games set up right now. I also own a TSSP (across the aisle from the DE Simpsons). Still like the DE version and play it regularly.
Let us know how the whole "I'm only going to have one" thing works out. It never has for the rest of us.