[Question] Model editing in general

[Login Error]

Well I'll come out and say it, I don't know shit about model editing, but i have a few questions.

1. Can only you see skin/model edits, or can everyone see them?

2. If you, say, decide to edit flat ground into a simple hill, and stand on top of this hill, would it look like you're floating to other people, since they're not able to see the hill? Would it look like you're just standing there? How does this work with holes edited into the ground?

[merfed]

1. Only you can see them, and anyone else who has the MPQ of changes you make or download.

2. When your standing on the hill it will look like your floating but you will continually look like your being pulled back down to the ground on their screen.