I've also lost my best (and only) friend recently.
If you feel like there's a part of you "missing" I can definitely relate. This cold feeling of abandonment is horrible, I wish it stopped.
This may not mean much, but there's definitely so many opportunities for you to make a new best friend. Sure, they won't replace your old friend but it can be a start of something greater and better, something you didn't even think was possible.
I'm planning on CTB via partial hanging. I'm scared that it will hurt a lot. I managed to buy a suitable rope and "practiced" a few times (lazily, not in a proper noose or anything, more info
here for those who are interested) and honestly I don't think it's going to be as bad as I've been expecting it to be if done correctly. The scary part is that I'm not sure how to do it correctly in a consistent, fail-safe way.
I don't mean this the wrong way, some people probably don't like me asking you this, but are you completely sure and certain you want to CTB?
If you're only doing this because of the loss of your best friend, you should know that those feelings will pass. However, I fully respect your decision if that's what you want to do. And to be fair I don't know anything about you. Do you have any other reasons you want to CTB?
I wish you all the best. <3