If first time drying, when they feel dry on outside, intiially, they are not dry, yet. After a few harvests you'll be able to tell just from picking up a bud if it still has moisture deeper inside. The surface evaporation is faster than mositure spreading out from inside the flower mass. Another 12-24 hours after it feels quite dry on surface is typically needed.
Garden snips will give you the closest trim. A motorized handheld might be okay for someone with arthritis, but probably going to nick the buds a bunch, lol. Can't get in tight with those things, though...
the bowl trimmers don't do a very good job. Just depends on how picky you are about it. Each to their own.
when it's fully dry, can often pull the leaf down the stem and it'll snap off cleanly. the sugar leaves will sometimes snapp off short of the stem, but can do that with them too. The dollar store silocon spatchulas sold for 10 dollars as "weed trimmers" essentially do this, but a gloved finger can do it just as well and with greater accuracy avoiding touching the flower.
so many ways to skin this cat... anything that reduces friction with the actual flower is a better way to go. your personal preference and level of patience will be the biggest deciding factors.
I like wet-trimming. Knock of far fewer trichomes before they get brittle (can see an obvious difference on your counter or trim tray.. undeniably true). hold by stem and still limit touching the buds all the same. The leaves are still perky, so it's eaier to snip them at the base of their stem, too. I'm not a fanatic when it comes to trimming. I take of fan leaves and trim back the sugar leaves as best i can, but i'm not digging into the colas to snip those at the base. I'll take care of those when i break up the buds to smoke.
if it's properly dried and stored, there's no concern if a little foliage remains. May even protect the trichomes a bit from direct contact... they shouldn't be agitated, regardless.
Boveda 2-way humidity packs are extremely useful, but if you smoke everything within ~3-4 months probably don't need those to maintaina proper storage RH.