so, it is important that you know what you want.
if all you want to do is just trim it round the edges without changing its shape too much, then a good pair of beard-trimming scissors should be more than enough to serve the purpose.
if you have a thick beard that you wish to trim, it is better to first wash it with soap or shampoo, in order to soften the hair. doing so on a regular basis is also beneficial from the point of view of facial skin care.
after you wash your beard, do not use a blow dryer to dry it. dry it with a towel instead. also, run 