I havent pressed my hair in about 7 months now, but when i did it was done every 2-3 weeks at the salon. Its only within the past 2 yrs i discovered i can do my own hair and i started pressing it myself. In the beginning i was using the old fashioned stove pressing comb, but last year i discovered the ceramic flat iron which i find is better because the old pressing combs have the tendency to pull the hair out. the flat iron is better cause u can control the settings reducing the risk of burning your hair plus it glides through smoother and doesnt pull the hair.
if you do decide to press yourself use a moisturizing shampoo and conditioner followed by leave in and add pressing creme to damp hair. detangle and blow dry with a comb attachment to make the hair smooth, then use your hot comb or flat iron to finish. dont overdo it on the heat because it can cause your hair to be limp and remain straight in some places.