If it is good money you are after In general I wouldnt seek a barista job especially at the beginner level.....but if you love it and have to do it then read on,
As suggested you might have to get in washing dishes or waiting for starters and get a little time on the machine here and there when it is not busy( maybe just pulling shots for starters), nobody(sane)will throw a beginner on the machine full time into the deep end especially when sometimes you are expected to make anywhere up to 100 coffees an hour(plus other duties)you would not be able to keep up with this workload.....baby steps first.
I know at my work this happens and there is only 2 of us on most times, as well as getting pumped hard with coffee orders we have to operate the register, do basic food orders(toast , croissants etc.), answer phones,do dishes, restock etc etc. at the same time....it can be mayhem and that is providing you dont make any mistakes.....
This is why most businesses want experience, it is the skill and the ability to cope with volume plus be versitile, fast on the register, maybe some cooking skills, waiting,cleaning??? etc.
It doesnt leave you much free time to check out nice looking girls......* :P
But seriously good luck my friend......keep on asking around offer your services for free even just as training, smile on the face and willing to learn and do anything should get you places.