I gave birth 7 weeks ago and I tried following pregnancy dos and don'ts throughout and had an uncomplicated, low risk pregnancy. Having forceps was my worst birthing fear.
I had a quick labour (5 hours) but my babys heart rate was dipping during each contraction and they wanted to get him out fast, so I ended up having a forcep delivery. I initially asked if I could just ha e a c section but they advised it would be quicker and safer for baby to use forceps, as his head was ready to come out. Turns out the cord was around his neck, and I am so glad I agreed to forceps and got him out the quickest way possible.
You can refuse any medical procedure but listen to their reasons for you needing an assisted delivery if that happens. A pp mentioned using the B.R.A.I.N methodology, and this is absolutely golden advice and one that I followed.
I can tell you, when you are in the throws of labour, getting baby out is top priority to you, and in my case they made complete sense as to why forceps would be the best for my baby.
I had an episiotomy and forceps under an epidural and I felt absolutely nothing! Afterwards it was a little sore, but the hemorrhoid I had bothered me more! I wont be scared to have forceps again if I had to. I don't look back on my birth negatively.
Of course do everything you can to give you and baby the best chance, but I think the most useful advice i can give you is to research and inform yourself of the all the possibilities you may have to face, and what circumstances you will agree to them. I found once I made peace with what will be will be, my anxiety about labour faded.