Trade with a non market maker broker, they take a commission, nothing more, or at least, trade with a broker that will not try to take 100 or 200 times the money you can afford to lose.
IG Markets is market maker on his the CFD.
So, they manage their prices on their products.
IG Markets chases negatives balances of their client. In 5 minutes, they can claim you 100 or 200 times the money you can afford to lose.
Without stop loss, you take an enormous risk to finally lose (potentially 100 or 200 times your balance account), it's obvious.
With stop loss :
When you win, you can see on forums many people complaining about stop orders executed, while the real underlying only went several points away !!
When you lose, they will not execute your stop order if they cannot trade a hedge on their side !! For example, the EUR/CHF quoted more than 1.17 one minute (which already is a very long time) after the PEG removal, but they finally executed the orders at 0.925 !!
And after this "treatment" of your positions, they will go after you to take the negative balance on your account (potentially 100 or 200 times the initial balance of your account), which is : the loss they managed (by not executing your stop order) !!!
My advice : Trade with a non market maker broker, they take a commission, nothing more, or at least, trade with a broker that will not try to take 100 or 200 times the money you can afford to lose.
This last point is very easy, just see the list of brokers that forgave negative balances of their clients after the EUR/CHF PEG removal.