The part that can be tricky is getting the old ones out.
Otherwise replacing is super easy.
OTOH if you don't want to do it and can afford to hire someone, yes, a plumber or handyman should be able to do them in less than an hour each (if the old ones come out easily, about 15 min.)
For me it falls into the category of "I can probably do it in less time than I'll spend waiting around for the plumber." And I'm not that handy.