Hmmmm, for sure you don't want to be pulling that massive bolt out of the swingarm while the bike sat on its side stand!
The engine won't go anywhere but the swingarm is held in place by nothing else, pull that bolt out and the bike will probably fall over. For sure you won't be able to get the bolt back in.

You're going to need the bike (i.e. the frame) held up by "something", possibly a strap round a ceiling rafter and maybe the rear subframe or something under the engine and a front wheels stand. Then something else to hold the rear wheel where it is (you want the rear wheel unweighted)
When you remove that long bolt all that holds the swingarm in place is the rear shock, that's a spring and numerous pivots.

I've never done this (why would I?) so look, think and learn as you go.
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