I used a battery operated impact gun...absolutely no problems

What a good idea...
 

2m and 30s in...
https://youtu.be/1fxRO8VvnrY

Proper like that "locking" 5mm bolt through the chain idea. I normally put a small crowbar through the rear sprocket slots and then onto the upper or lower face of the swinging arm which locks wheel rotation . With the chain attached in this way, front nut torquing is easy, just not professional. I'll be using that bolt method from now on......hash tag - definitely still learning after 40 years on two wheels.

Well I've replaced the front sprocket and the rear, plus chain and used the bolt idea first time in 40 years. It is by far the easiest way to do it.

No need for walls, buddies, crow bars, or even putting the bike in gear.

You don't even need a centre stand if you can jack up the bike.

Just use 2 bolts fore and aft of the axle through the old chain. It doesn't matter if you have already cut the chain.

Don't forget it's 120 Nm or to replace the tab washer.