Of course I do, don't we all. But that doesn't mean I'd walk away from a job like this. Being new to the industry isn't an excuse either. If you put yourself out there as a professional then you can either do the job or you can't.
As a carpet cleaner isn't your job to clean carpets, whatever they may have on them to the best of your ability? Do other professions such as nurses and firemen take their pick as to what jobs they fancy doing?? ( perhaps an unfair comparison, but you get the idea).
Thanks for offering me the work. If I was closer I would do it. But surely there is a professional carpet cleaner in the area who is actually capable of doing it.