They don't mean the same, Taka. 'Here goes nothing' means 'I am going to begin, but I think I will not succeed, or I think it will be very difficult to accomplish'. 'Here we go' just means, well, 'here we go, we are starting'; it also sometimes means 'here we are' upon arrival or success.
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01cite10Clive12cite11font10Thus, the meaning of the two phrases is not even 'almost' the same.12font12br10I agree that the phrases are not almost the same at all, though I am more familiar with MM's depiction of its use.0-
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