It's tight...
Are you changing the lens to a clear lens, as I did?
Good luck!
You might want to wrap a slotted screwdriver's edge with masking tape and then use that to help you to pry the front part (furthest from the wheel, to give you some point of reference) of the lens out a bit. You will need to pry outwards and push backwards simultaneously so that the lens clears the plastic lip that holds it in.
Are you changing the lens to a clear lens, as I did?
Good luck!