you won’t die, but you;ll wish you had at one point. Your first pint won’t touch the sides.
I ride 32:16 in the peaks (I’m in marple on the other side to you) and while it’s bloody hard work, it’s very satisfying, and in my local area there are very few climbs that I can clean on a geared bike that I can’t clean SS.
You will hurt everywhere tomorrow – SS is a full body workout, as you will be out of the saddle and heaving on the bars.
Best tip – it’s about momentum. Brake a little as possible, stay loose and let the bike float under you, attack the hills for as long as you can then get off and push
and remember at the end of the day it’s just a bike, so smile and enjoy it