They are a pain in the arse!
I will assume you have got to the stage of removing the rubber cap that hides the sidelight and indicator bulbs.
If you have the smallest hands in the world you can just give the plastic bulb holder a good tug (a twist might help) and it should come lose.
I have large hands, and so used a pair of needle nose pliers to pull the holder free, but be very careful not to pull on the wires. (if you have needle nose pliers with the bend half way down these would be even better.
On the drivers side there is less room to get to the rear of the cluster, but the black oblong box thats in the way can be removed with upwards pressure, as it just slots onto a mounting, which will make the job a whole lot easier.
HTH
Rich