

You can always stop and call for help.
Don’t do anything you aren’t trained to do, and always ask “can I help?” / get verbal consent if they are conscious.
The danger is just if you have bad judgement. Say you saw a tourniquet on a TV show so you think you know when it’s appropriate to use a tourniquet - or if someone is injured and you decide to move them which makes them MORE injured. (Note: you CAN move them away from a fire or something that would otherwise kill them. “More injuries” is better than dead.)
But you can ALWAYS stop and be kind and call for help and wait with them!
If you act in good faith and aren’t trying to “play doctor” when you aren’t one - no jury is going to punish you for that. If there aren’t good Samaritan laws in your state (there are in most) they might be able to take you to court but they won’t win.
If you are tense and emotionally uncomfortable and/or the doctor is rough or rushed or just uncaring = it can be a bad experience.
Generally speaking the speculum is not comfortable but not painful. It is there so they can use a swab to get a sample from the woman’s cervix to check for abnormal/cancer cells. Some women don’t even feel the swab and others find it painful - most feel it but don’t find it particularly painful. If they do find problematic cells they cut a little bit off the cervix for testing.
I have always had nice doctors - when I was younger I felt a little weirded out - but never uncomfortable or in any pain. Until I had a cervical biopsy- which did hurt and left me cramping for a bit. But it hurt at around the level it hurts to get stuck with a needle when you give blood. Yes, it hurt - but not severe.
It’s just much much more scary to hurt in a sensitive area then it is to hurt on, say, your arm.