My own experience tells me I would not have been ready with only 200-300 hrs to undertake a multi-engine instrument rating.
I had around 1000hrs before I started my rating. When I recieved my CPL 15 years ago I think there was a lot less CPL,S with instrument rating. Having looked at quite a few resumes lately it seems that low time CPL,S all have rating. The only I advice I would give is, get out there and get some practical experience in flying an aeroplane all by yourself first.