Even we research a lot, sometimes it is impossible for us to predict the loss, though we should consider it as a mistake made by us, the business itself, there are ups and downs we have to accept both these tasks and move forward. A positive attitude will always improve the standard, which we might not repeat the same mistake every time.
Researching the market is not the end of learning. We nees to study everything so we can avoid future losses. Though it's not that 100% assurance you will get the profit, you may escape in total burning of your assets. Having your own analysis is enough to recover losses in trading. I believe that market also a factor why do we lose, but most of time our perfect execution and plan dictate our earnings.