signal should we need until whenever. because the signal can anticipate us if the market starts to fluctuate up or down. so in trading you must be good at doing analysis to determine the right time for us to move to a good position
Signal might could helps you sometimes but it really not necessary, though. If you have times and skills to do your own analysis either technical nor fundamental then why not, rather than relying and gamble on others people decisions it would be bettter lean on our own analysis.