I can only tell you my birth experience, I was also adamant that I wasn't having forceps or ventouse. I even decided I didn't want an epidural in case it made me unable to push hard enough despite my contractions being 7/10 (I think that's what they told me) so I wasn't getting a gap between them to recover!
It only took me 4 hours to get from first contraction to 10cm and I was thinkin how lucky to have had a short birth! I then started pushing and ds changed position and I couldn't shift him.
I was pushing for 2.5 hours, I was at the point that I could no longer feel the contractions and I was mentally away with the fairies but I know I refused to consent to forceps, although I agreed for episiotomy despite not wanting to as the midwife had told me I would probably tear badly as ds was big and (her words) I wasn't stretching very much down there!! 
I didn't realise at the time but ds's heart rate was dropping and in the end dh had a quiet word with the consultant who was there and told him that ds may be in danger if they didn't get him out quickly. Dh asked about c section but was told they would probably have to use forceps to get him out that way as ds was too far down the birth canal.
I begged for slightly longer to push, they told me they would let me keep pushing while they got the forceps ready. I had a mw telling me when she could see my contraction on the monitor and I pushed with renewed vigour as I was so desperate to avoid the forceps.
Anyway, I managed it. I think I had basically given up, and that immediate threat of forceps and knowing my ds was in trouble gave me the second wind to be able to manage to do it myself. I know all births are different but I've never felt such a sense of accomplishment! Turns out the cord was around ds's neck so I'm glad he came out when he did.
The episiotomy was sore afterwards but was all healed up within 3 weeks, me and dh first made love again 5 weeks after the birth. I'm glad I didn't choose to tear as I didn't feel the episiotomy and would probably have needed stitches either way!
Good luck with the birth, FWIW the mw I had looked at my birth plan and even commented after about how close the birth ended up being to what I'd wanted so I know she must have paid some attention to it!!