Bowens disease on palm

I was diagnosed with Bowens disease on the palm of my hand  a couple of months ago following a biopsy. I had been treating a sore spot on my hand as a wart/verucca for almost 3 years before i mentioned it to my gp, who referred me for urgent dermatology consultation.

I had an excision biopsy in August. Results were given to me when I went for stitches out. Dermatology MDT recommended an excision removal with full thickness skin graft due to location, which is on the 'heel' part of my hand, close to my wrist. The aim is to remove it completely, though no guarantees.

I'm absolutely terrified! The surgery will be done in 4 days. I have a good pain tolerance threshold, BUT, the biopsy procedure was EXCRUCIATINGLY painful.

I know it needs to come out but I am filled with dread. It will be done by specialist plastic surgery team in Sheffield 

Any reassurances or experiences please?