Using the stop loss is very important because it's help all traders to limit their losses and protect their account to avoid lossing the capital and i advice them to use also the money managment and risk managment because they have lot of benefits and advantages.Trading without stop-losses will never be a good idea, if you want to be a successful trader, you should always learn to keep your account from great losses.
But what is most importantly is the size or the volume that you have to enter? I mostly close my trades manually. When I am confused about the market, I enter with low lot then if it gains profits, I will re-enter at appropriate price with normal lot and if it goes against me, I close it out. This way I won't be getting high loss. This works great for me and also increases the profit potential with low risk.