how do you sit in trees

I need to redo this layout and categorize all the other stuff but...

i want to change my deer up again and i need some help to do it uou all i want are the venetian antlers and the real deer mask.

I am BRAND new here and I don't have a clue how to do anything?? I just want to know how to change my skin, and how to look like a REAL deer. Please respond ASAP because I really want to play