What bike is it you have Bergspre?
Getting the front sprocket nut undone can be a real bitch if it has a single large retaining nut (note also if it does, there will be a lock washer with a flange you need to fold down before you can turn the nut) - so as edteamslr suggests, it's worth keeping the old chain on while you crack that nut - and you might well find someone sitting on the bike and pressing the rear brake pedal is essential!
As for torquing up the rear wheel axle - while the workshop manual probably has some astronomic value in, a good trick is to only do it up as tight as the spanner you have in your travel toolkit, and your own strength allows* - after all, it's no good if you've torqued the bastard right up in the workshop, only to find you have a six-inch long spanner to undo it in the event of a puncture?
*obviously if you are a weedy weakling, then it's worth getting someone to do it up properly, but I trust you can nip it up nice and tight by hand x
xxx
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