Implant

Sally
I'm 23 and have been on the pill for the last three or four years. I have insanely irregular periods, and the pill really did help regulate it some. My cycles last anywhere from 45 to 75 days without the pill. I'm not so good at taking the pill at the same time every day and talked with my doctor about other options. 
I'm getting the implant in a couple of weeks. For those of you who've had it, can you share your experiences? What should I expect?