One addition though, some implements are still quite stiff to turn the shaft by hand, so I keep a small bar handy for leverage to rotate the shaft. I use a piece of 3/4" round rod cut to about 18" long, this can be placed through the Yoke on the drive shaft of the implement for extra leverage to turn it. Hope this helps.
On my BX, I just switch it to mid pto only.
And yes... always turn the machine off and pull the key.