While you’re still setting out, you don’t want to risk blowing your entire account on a single bad trade. You can avoid this eventuality easily enough by limiting the capital you allocate to your positions.
The standard FX trade size is one lot, which will give you a large exposure and can see losses mount up quickly. Look for a provider that enables you to trade in smaller sizes – with City Index, you can set your own sizes outside of traditional lots and mini lots.