Sorry, this is going to take the post off-topic a bit, but I just wanted to respond to this and then respond to your original post, Niall.
My safety plan that has kept me alive to date is - when the needing to end it gets really bad, I get really drunk, as quickly as possible. Not the best plan but it's very hard to do something technical when you're seeing double and too drunk to stand.
I would recomend that everyone feeling even a little suicidal gets together a basic safety plan - preferably one that's better than mine ;)
Lightanddarkness, I do relate to what you're saying and I admire the fact that you're recognising what's causing the urges, and you're working on them. I completely agree with having a safety plan. I just have to say a couple of cautions about your strategy. I know you've said yourself it isn't the best but I think - and I hope you'll take this as being meant with sympathy and concern - it's one to change as soon as you possibly can.
As someone with an alcohol problem who started out thinking I was giving myself a break then progressed to justifying drinking as a better alternative to more drastic measures... well, I'm still here and now I have even more to deal with a result of the alcoholic "coping" I did in the past. If you can then please, for the sake of your future self, see if you can find another strategy.
The other thing is that alcohol lowers inhibitions so although you may be incapacitating yourself there's a risk that you'll incapacitate your judgement/survival instinct but not your ability to act. Certainly not your ability to have an accident.
I'm not going to say the thing about alcohol making you more depressed because that was always a completely pointless argument to me when it was giving me oblivion for a short time. What I would say is that at my worst I was far beyond finding comfort and encouragement in anything. Incapacitating myself was the only answer, but before I started drinking I used to do that by having a strategy of getting into bed, staying there and making my mind as blank as I could. (And by not having anything in the house that related to my method of choice.)