I think everyone has their own preferences in trading and whether a signal provider would be beneficial for them or not depends on their trading style and knowledge. I think that trading indicators are also useful since crypto currencies are highly volatile.
Trading indications are yes really needed, besides this, one must be updated on news and updates of the coin he/she has invested, so that one will know when the coin will spike up or fall down in the market. Choosing the right and the best coin to invest is really must. Need to choose the best exchange where the trading volume of the coin you wish to invest is really high. Besides all these, never ever panic or fall into market manipulation which will lead you to loose. Be patient enough always