My MO is usually washing all the sprues right away with fresh water and dish soap (I never use warm water as I'm always scared of any warping in larger parts), then as I'm needing the parts, cutting them off the sprue with a scalpel to minimize chances of any damage by using a plier.
Note that from the moment that I wash the sprues, all parts handling is with gloves on (the thin rubber ones with no powder, they're cheap in packs).
After that I remove the mold lines where they're present, first with the scalpel, and then with by wet-sanding. Then, wet-sand all the part so that the primer (never used any other than white, never felt a grey one was needed) has a "bite", and standard painting from then on. Can, brush, airbrush, whatever feels and looks better depending on the part in hand.
After a while it's all part of the process, you don't think of it as "more work" to be done. đź‘Ť