I use an old spoke, cut to about 5-6" long, as my"tool" for rotating the hub shifter interface.

Once you get used to the operation, t is actually quite simple, and I find I can remove/install the rear wheel nearly as fast as with a derailleur. The 15mm nuts add no more than 10-15 seconds, and the cable chock removal adds 5-10 seconds, MAX. In the context of a tube change, this is negligible.

I'd recommend practicing a little more, using a cut-off spoke or a 2mm hex key - it really does make life that much easier, and you'll also get the gist of what to do. It is really easy.