I have a stand alone shower that has a Delta single handle control. I have tried ever trick I can think of to get the handle off. I have removed the set screw but the handle will not come off.

I think I am going to have to remove the whole shower valve and replace.

Looking at the picture do you think I have enough room to complete the project with the current hole? Or am I going to need to make a whole in the wall behind my shower where the toliet is?

Thank you all for any suggestions you may have.