Hey. I'm sorry you're going through this situation.
I can relate to you as I have also been invisible my whole life.
Maybe it's so hard because it's easier to not take any action. That's how it is for me, anyway. There's the planning, and the risk of failure, and the survival instinct which can be big deterrents.
Also, it can be really hard to imagine being gone forever. I still feel uncomfortable about that.
Even when you're completely isolated, it can be just as hard to attempt.
I always thought that the worse my situation, the more likely I was to attempt, but that isn't necessarily true. That's the worse thing about it: you don't stop things from getting worse because you think that that'll make it easier for you to die, but then it's just as hard.
Stupid survival instict.
Some people are able to attempt better in a certain mood. For me, it's when I'm happy, angry or desperate. So, I can listen to music, think about everyone who has wronged me, or convince myself that I'm about to be sectioned to put myself in the right mindset.
For some people, calling the police works because it makes them feel forced to act.
I guess if you haven't already, you could try familiarising yourself with your method (e.g. setting the equipment up/scoping out place of death/getting used to being around chosen weapon, etc).
I also know that every day will be the same, and part of the reason I stay is because I like thinking.
It should be easier to attempt when you logically know that things won't improve, but the survival instinct seems to manifest itself in lots of different ways.
I'm an athiest, but I find the notion of my death more comfortable and meaningful if I imagine that I'll be reincarnated back into this life, or go to an alternate reality in whivh I am still alive, or something like that.
You could kid yourself that anything you want could happen after death, and it wouldn't matter that if it's true or not. Just anything that makes death seem easier.
Either extreme nonsense, or try to see it as logically as possible, where it's an inescapable process.
If only we were able to determine the chance of success of our suicide...