Just go slow. 1st time I took mine off I discovered it was held on with strong 2 sided weatherstripping that stuck to the top & to the bulkhead.
You don't want to force it & have the 39 year old top to crack or break where you try to pry it off.
Use a solvent like decal remover or wd40. Test whichever will melt weatherstripping, that is stuck to something on your workbench, 1st.
Once you find one that turns the sticky part into goo that doesn't stick as much, try it along the top of the bulkhead with one of those fine straws attached to wd40 or whatever.
Hope this helps