Is it a risk to carry on in the gym without a trainer ?

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Hello MyLotters!! I want to go to gym and make a good shaped body! I used to go to gym 3 years back and left it within 6 months because I couldn't carry it anymore. Now again I want to go to some other gym, I have found one but the problem is the trainer use to come only twice a week and that too for 1 hour anytime in the whole day!! Is it huge risk to go for bodybuilding without a trainer ?