You'll save a lot of money by doing it yourself...but I understand everybody doesn't have the time or the skill to master it. I haven't been to the barbershop since I was probably in my early twenties and my barber used to charge $10 due to him knowing my parents since I was a toddler.
I cut, trim, and shape up my hair and beard myself, shyt I'm good enough where I probably could've gone to barber school and became a barber myself.
I went through trial and error in the beginning but gradually got better that I'm like a skilled pro; the key is to invest in a good set of clippers, trimmers, mirrors, brushes, combs, and oils (to clean the blades), etc.