If it’s possible in your operation, ask if you can go in the sim when there’s a free slot and a friendly trainer or panel operator available and have a good practice session. Staring at the manuals is no substitute for the real thing, and you will be surprised how little time it takes to get your confidence back. IMO most of us don’t get the opportunity to get totally proficient at EFATO/OEI stuff simply because we don’t get enough exposure; there’s a way to remedy that...