I place the bike in 2nd or higher gear, step on the rear break and tighten away. If you need to remove the break leaver, I have also put in at least 2nd gear, had friend hold bike up with front wheel against a wall, and then tighten.
Forgot, the primary drive bolt; you can get a special tool to hold the basket (if the basket is driven from the engin side). I have made a wooden holder that grabs 4 if the basket fingers for my RM (1/2" plywood cut to fit in the basket, large hole in center, old trowl/small shovel as a handle). I have heard of wedging a shop rag between the gears to stop it so you can do this; but I have never tried that.