Oh, Yeah I have lots of practice. I think the key to that is always cutting off the end, not breaking it off. I have a set of sharp wire cutters I keep with the printers and bending it nice and straight.
I always try and get the filament switched before the LCD goes back to the main screen….stupid little game you play when you are always messing with printers. Cutoff the end of the new filament, bend it straight, hit pause (during infill), switch it fast, hit resume…Bammm, fastest gun in the west.