1-Transfer fiat from bank to Coinbase/GDAX.  Once there - buy LTC or Ether on GDAX with limit order (it is free).
2-Transfer funds to an exchange of your choice that has the alt-coin you want.  I use Kucoin, Binance, and Bittrex.
3- HODL until you have met the conditions you set at the outstart to sell (ie 2x, 10x, moonshot, whatever)
4- Trade back into Ether or LTC and transfer back to GDAX and do the reverse of step 1.

Alterative step 4 - use one of the vendors that accepts crypto and spend Eth or BTC.