With practice it becomes easier so take your time.

Some tires are easier to mount or dismount than others, but you will get better at doing it yourself. Are you able to put the tire lever under both sides of the tire or are you using the lever on one side and sliding it around the rim?

After you get one side of the tire off the rim are you then pinching and folding the tire off? I know this might sound vague so I will look for a video or something to help.