It is absolutely important to have a SL.
Before you enter a transaction, you have to understand where your exit is, otherwise you are bound to fail.
Another point I would like to make is, I see a lot of people making the mistake of placing their SL based on a fix% of their capital, in order to follow along with the 2% rule, which I believe is a fantastic rule, except they are approaching it in the incorrect side, rather than placing ur stop reduction in at a random level so that you simply lose 2%, place it at a reasonable level, and then adjusting your posture size to then equal 2% after...