You should get someone to be nearby in case you get lightheaded…and assist with the install…and hold the tools for you. What I’m saying is find somebody to do the install for you and don’t do it yourself 
it’s too much
I’ve had 3 magnet installs, 2 smaller ones in the fingertip and an xG3 in the tragus. Magnets are some of the most involved implants available right now. The xG3 is big. It’s gonna be a real pain in the ass to install it in your finger without it rejecting after a week. I don’t know if a butterfly closure will be enough, you might need a stitch.
If you do go through with this, you might want to get a scalpel and some kind of dermal elevator to make an appropriately large pocket, and then pop the xG3 out of it’s injector on the sterile field and have it inserted in your finger by hand.
These two people have had xG3s installed in their fingers. The forum’s search function is your friend.