If you trust an indicator you'll lose all your money even if you don't trust an indicator you'll still lose all your money anyway actually it makes no difference
Unless you know how to trade its the same with stop loss, whether you use it or you don't it makes no difference you'll still lose all your money, only thing is if you use SL you will last longer .... it will be like bleeding you to death drop by drop rather than chopping your head off in one go ... the final outcome is the same for both scenario's and that is death ... for sure.
By saying "know how to trade" I mean you have to have an edge something that will come out in your favor over time given many repetitions. Now if you combine that edge with indicators for timing, indicators may help in that scenario.
You don't have to take my word for it but here's what traders with proven edited track records have said. Larry Williams has said "indicators are the biggest sham in investor knowledge that he knows of" he does use them but his edge is the COT or some other relationship he uses indicators for timing.
Victor Sperandeo although he went bankrupt was successful for many years and in Jack Schwager's book says the same thing in fact he includes the whole of TA instead of just indicators ... he said "TA only helps if you combine it with something else"
Same with Willaim Eckhardt (Richard Dennis's partner) he shows total disdain for indicators and said "indicators are 99% useless" once again in Schwagers book
So you decide.