Yes, come and join in on the "advice on becoming a runner" thread. It started as advice and has now moved on to general chat about how we are all doing (although we still ask and offer advice as well). There are several people just starting out as well so you can have some great advice as you progress.
To answer some of your questions:
Quite a few people repeat weeks and that is fine
You will be amazed at how quickly you progress to running for longer times or distances, but for those of us still on the C25K I wouldn't say it gets easy. You are always pushing yourself to run for just that bit longer. It is great when you can reach that 20minute mark - and you will.
Several people have taken time off running to recover from injuries, and at least one person went back a few weeks because they think they progressed too soon.
Congratulations on completing your first week. Keep on running