Yeah they need to be pressed on and off. My Dad did mine for me at my uncles workshop. The easy part is pressing them on. Pressing the old ones off wasnt as easy as dad had to use the backing plates to push against which distorted them so i had to bend it all back straight to stop them rubbing the inside of the drum.

All diff shops should be able to help you out dont know what they charge though. If you really get stuck give me a yell.