If you're good in trading altcoins you first have to buy BTC too.. Or you should look for a trustworthy altcoin seller, but they're rare.

This may actually be a good moment to buy BTC directly as it's value is decreasing now. Maybe you should wait a bit longer, as the price may decrease even more. You can use websites such as Bitcoinity to check the current value of the Bitcoin on decent exchanges > http://bitcoinity.org/markets