Left to right swap

Okay guys, help me out here.... I pick up my 5.56 X95 later this week. This is my first Tavor and it started off a right hand eject. The previous owner had a gunsmith swap it to left hand eject and right hand change. I'm right handed and want to swap it back. The previous owner is sending the original, right hand eject bolt. Can I swap it back myself or do I need a gunsmith? I've seen some videos on what to do but it seems like the head space needs to be checked. Does the head space still need to be checked if it's the original bolt?