Hire a professional.

This is not a difficult DIY, and there are scores of YouTube videos out there. The main thing is you are going to need to repair the cement board behind the tile first before you can actually replace the tile..

I wouldn’t use a shark bite inside a wall. They are really convenient but I would personally never put one where I couldn’t look at it periodically to look for drips or failures.

As the poster above said, you will also need to repair the cement board behind the tile you removed. It may be easier at this point to expand the whole a bit so that it makes all the repairs easier.

You will need to make the hole bigger as others have said. Since you need support behind the wallboard. Dont feel bad, ya gotta break a few eggs to make an omelette.

And dont use a sharkbite, solder all the way here.

Where I live, shark bites are not code when they are hidden in a wall, they can only be used where visible. You could swap to a pex or reuse copper.
Looks like the brass 90 needs to be replaced to that wood, then the shower head nipple screwed in. You should be able to splice in copper to the existing run pretty easily. I'd use the fire blanket material so you don't melt things. Otherwise a pro plumber could knock that out preeeety quick (piping wise) the patch for the tile, you may need duraroc and a backer 2x4 chunk to attach it to, then waterproof/mud/tile.

Make sure that pipe is good and secure behind the wall before you close it all back up. You don't wan't constant knocking everytime you take a shower.

Yeah, idk I love access panels for things like this. You'll have to get back int here at some point in the future....

When you put the shower head back on, this stuff is so much better than PTFE tape.

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