Section I: Practices
When a man or a woman gets a haircut, or a man trims or shaves his beard, each should have this done by a person of the same sex..
1. A man does not shave, nor permit others to shave, his beard at all, with the exception of the mustache that overlaps the top lip, and this is only to be trimmed to above the lip with a scissors. (8)
2. According to some, a man does not allows his peyot i.e. the hair of his temples and upper sideburns between forehead to back of ears (i.e. sides of the head) to be trimmed (9) except when the peyot extend past the length of the beard and then are trimmed with a scissors (10).
3. A man should keep the hair of his head short (11), with the exception of course of the peyot and beard.
Notes:
1 Shulchan Aruch, Yoreh Deah 181:12
2 Shulchan Aruch, Yoreh Deah 181:6
3 ibid.
4 Shulchan Aruch, Yoreh Deah 181:3,10 and Har Tzvi, Y.D. 143
5 Makot 20A, Rambam, Avodat Kochavim 12:6
6 Shulchan Aruch, Yoreh Deah 181:3 see Veyesh Osrim & 181:11 & Arizal quoted above.
7 ibid
9 Shulchan Aruch, Yoreh Deah 181:11