Take the light unit off, and you will see around 6 screws around the inner side of the cluster. Undo them and slowly pull it off. Theres no glue involved usually.
put them in an oven for 5 min and the glue will melt than get off the lenses and too glue it again put it in the oven for 5 min and the get it out and press it to get it in place always wear the gloves for this process