I have never considered using SN and couldn't do as have very severe gastric problems anyway, so would be a no go method for me. When I researched it awhile back and seen about making body blue, then that made me shudder too. I am suicidal, but will always think about the consequences, prior, during and after and that will always include state of my body and the poor souls who have to find me and deal with the process. So will wish to make it kindest not only to myself but others afterwards. I say kind to myself too, cos I dont deserve a painful or horrid way out, I have suffered enough here, so am wishing to exit peacefully as poss, just dont know a way yet.
Your method of jumping, will take a lot of guts and strength, SI will be very strong. Its not a method I would choose for many reasons. But regards SN it seems popular awhile as its fairly cheap and easy to obtain, but I wouldn't personally trust it as a way to go for myself and am very scared and wary when others choose the method.