Scissors?

[shaved]

Yes a scissor and comb can be a good way to trim off long hairs and trim lip line, Thin hairdresser type of scissors best as blades very thin and can snip in close to skin
 But best is a decent beard trimmer with the differant thickness combs easy to trim up and run over beard for a fast groom

[D.A.L.U.I.]

I use a #4 on my Wahl on most of the beard, except the stache and below the lip.  I'm trying to get those areas to grow longer to give a more dense look.  When I do have to snip out a wild hair here and there, I use a small sissors that came w/ my moustache comb for a couple of bucks at the pharmacy.  Very handy little comb--I can brush the stach to the sides before eating and it makes it easier not to accumulate too much in the stache.