It's always a good idea to book an appointment. Especially with one of the more experienced artists. Some of them can be booked-out months in advance
For piercings, no those are a walk In basis, however with tattoos, depending on the artist you want, they may be booked out weeks in advanced so it's a good idea to get an appointment. If you walk In for a tattoo they are usually really good about finding you an artist.
Yes, go inside to make the appt. 50 bucks to reserve an artist's chair. The 50 goes toward the final cost. As previously said, some artists are booked weeks, if not months out.
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