"A hint is one thing, but simply sharing the answer it leads to is dangerous."
– Kyoko Kirigiri.
As easy as it is to demonise pro-lifers, the barriers put on the bridge were more than likely a poorly calculated government attempt (they are really disorganised) to stop something they really haven't thought about. For starters, it's just a really dumb idea to start prevention by cutting access to the painless methods because it's like jamming a soldier's gun. They will just beat the enemy to death instead. So you should forgive them for their stupidity / lack of awareness, and it could help you reconsider... mangling yourself with an electric saw.
@Nina1 I am empathetic (despite how I sound) and relate to your situation, and am really not trying to be mean, but please use your brain, even in these trying times. There are less awful methods available, especially if you have money to spend. If you are seriously considering that, you should take some time to reflect on whether you really do need to commit right now. I'm not looking down on you... but as it stands it does sound like your mental state will be improved by just having a rest.
Also, if you are a cutter as you say, that is actually something I believe you can get help with in this society if you "reach out" (find a mental health counselor in your NHS branch if you have one) or if you are traumatised by your experience with them (not surprised) there may be videos on YouTube or someone here willing to help with it (you can PM me but I have no experience in this matter.)
Again, I am absolutely not looking down on you, your situation is much much harder than mine & I spent around 20 minutes thinking about this carefully so I do care. I believe suicide is best clean not messy and gory. PM me anytime