I will echo the comments above. It really has become a pretty decent site. In case you don’t know, you can preview plans and pricing as of today. I would suggest you do everything in preview mode even after November 1 before you actually attempt to create your account. Decide on exactly the plan that you want prior to creating the account. Then when you start creating the account and start your Application, it will walk you through whatever information it needs.
When I first signed up to years ago I had a little difficulty knowing how to answer a couple of ambiguously worded questions related to when my coverage from my employer actually ended since COBRA was available to me. I answered the questions apparently incorrectly because it indicated I was not qualified for a subsidy. I knew this was not correct so I called the helpline and explained my termination dates and situation and they changed my answers on their side and that solved the problem giving me the accurate subsidy that I knew I was entitled to. I doubt you will have that problem since you’re coming from another exchange already.
As for the estimation of your income as said above, it can be as simple as you simply enter the number and it accepts that and moves on and calculates properly. However I have read comments on various forums indicating that they had to supply documentation to prove their income level. I never had to supply anything. They never asked for it and I just entered the number and they took it.
By the way I’m going the other direction. I’ve been on the federal exchange for the last two years but will be leaving it this year to use the Pennsylvania state exchange which is new this year. So I’m a little nervous myself.