Firstly I'm sorry for the loss of your baby. It's a horrible, horrible thing to experience.
I've had four miscarriages and have experienced natural mc, medically managed mc and also ERPC. It is very difficult for others to say what your mc will be like, because everyone seems to have very different experiences. For example,
I didn't have pain with any of my mc (at 4 1/2 weeks, 7 weeks, 8 weeks and 12 weeks), but I know others have very different experiences.
Also, it may be helpful to know that there is no guarantee that you will mc naturally in the next week or so. It is not uncommon for missed mc to be diagnosed at the dating scan when the baby has stopped growing 6 weeks earlier. You may decide that you only want to wait one or two weeks to mc naturally before wanting more medical intervention.
If you do start to mc in the next few days, my expereince of an 8 weeks mc was that physically it was actually ok. As I said before, it wasn't painful and the blood loss was similar to a period. However, I would not recommend waiting to mc naturally until say 12 weeks. I had a medically manged mc at 12 weeks and the blood loss was frankly pretty horrific. It was ok because it happened in hosptial and I felt safe and cared for, but I think it would be a pretty alarming to experience this at home. I was also advised to wait 3 months after the medical management before TTC - although the Miscarriage Association did not agree with this need to wait.
If you go for the surgical option, it will be over very quickly but of course you will have to have a general anaesthetic. I was very aprehensive about this, but again, the reality was actually OK. You will also need someone to look after you for 24 hours after the op as you will probably be very woosy and might have some co-ordination problems.
Good luck with whatever you decide to do.