I had a natural birth as in, I had no pain relief.
I was induced by pessary so not natural in that respect. But no drip.
I'm not going to lie to you, it fucking hurt. It really really fucking hurt. BUT, unlike you I was not prepared. I had not planned for a natural birth, I had not done any hypnobirthing, I had not even learned any breathing techniques.
I wanted a water birth, but was not allowed one due to being induced.
I wanted pain relief if not in the water, but no fucker believed I was having 'proper' contractions, and by the time I had convinced the HCA to get me a bloody midwife, it was too late and I was pushing. (Incidentally nobody believed I was ready to push either which meant I ended up giving birth in induction suite, and giving everyone in the room a firm 'I told you fucking so' afterwards)
However do not be put off by my experience. Loads of people have natural births and fly through it. Every birth is different!
Also with the weight thing, mine was about half a pound bigger than they thought so don't worry too much, baby might be smaller than they think.
You can't really predict what's going to happen and I would just suggest going in with an open mind cos although you have a plan your baby doesn't have a copy.
I was devastated when I couldn't have the water birth I had planned, so if I have another I won't even bother making a plan to be honest