When I did mine, no jumping on a breaker bar would loosen that nut (new from the factory), but an impact wrench spun it right off. I've also heard, and it seems reasonable, that it's a bad idea to use the transmission to hold the shaft so you want it in neutral for the work, especially if using an impact. Next time I change it I'll find out if red loctite was a bad idea.
Not to be contrary, but for removing the slave I've used both methods - cable tieing the lever, and cable tieing the piston and they both worked for me. Strapping the lever down seems counter-intuitive, but it locks the piston in place to keep it from popping all the way out. This is the method recommended in the FSM.
It was mentioned above, but don't forget that long metal spacer on one of the clutch slave bolts; you can break something re-installing if it's not there.
2014 V-Strom 1000 ABS, Khaki
2016 GSX-S1000F, Red/Black
2013 V-Strom 650 ABS Adventure, Black/Gray
2012 DR650SE, Grey