ive done both with and without. was taught without incase you were in the scenario you didnt have one for whatever reason. but like gary and andy have said when youre banging on 4.5.6 wet walls or a ceiling and 4 walls or whatever. id rather have my corner trowel anyday. you just need the right one. i have a MT and its **** hot. they do a drywall one which is shite cus the angles wrong but they also do a 90 degree trowel and its mint. i also use a small brush when skimming hard angles.