You will not be able to avoid the possibility of testing the waters on other coins before determining what coins should be worth to trade based on your preference. There is a chance that you might be wreck along the way.

Are you new to this crypto thing? If yes, then focus on BTC "for the meantime". Just jump on other altcoins once you understand how to play on those. We are just minimizing the risks since it's already a risk putting money on BTCitcoin.