Quick Questions HORI 360 Stick

I’m new to the whole modding/swapping out parts on a stick and have a few questions about how I should go about doing this.

1.) What size are the buttons? It’s the Hori 360 VF5 stick, same as the DOA4 stick except for artwork I guess.

2.) What would be the best way to replace the artwork? It looks just like a sticker is on there, should I rip this off?

These are the only questions I have so far, I’m sure that I’ll have more to come as I start taking this thing apart.
Thanks for all those who read/post on this thread, the help will go to good use.