Make note of your entry and exit points for your succesfull trades and count pips. That should give you an idea of what stops to use for your trading style. Most newbies tend to be a bit conservative with their stoploss, that’ll kick you out of a trade real quick.
I honestly believe stops are important. However, one has to be worried about stop hunting. In general I believe it is a good rule of thumb to not risk more than 5% of your capital on a single trade. However, I believe you can bend the rules if you have a solid system and can afford big drawdowns IF the rewards is greater than those drawdowns! If you can only afford a 30 pip stop on cable then your lot size is probably bigger than what you should be trading. Cable is a pretty volatile pair so I don’t believe a 30 pip stop will be sufficient. A good rule of thumb is to throw up an ATR (Average True Range) on whatever time frame you are using and doubling or even tripling it to use that figure as your stop. This will typically avoid noise.
Without information on your particular situation I can’t give you advice relating to your particular situation.
Ill assume you are in the US so stops are even more important for you! Cable is especially volatile during London session (my favorite session) so it can easily move against you substantially. If you dont put a physical stop, at least put a mental stop so when you wake up in the morning you will know to get out or not. However, I believe the best situation would be having a wide enough stop to avoid noise and wide enough so if it gets hit then you where wrong about your position. Stops aren’t really about money management. They are more about telling you that you where wrong about your perception so if they are hit you should reevaluate what you where thinking. So start thinking, if I am totally wrong about this where would price have to go to prove it, put your stop there