Start conservatively. Choose a weight that allows you to complete every prescribed repetition with controlled, technically sound movement, while feeling that you could still perform around 2โ3 good repetitions at the end of each set.
For new exercises, begin lighter than you think you need and increase gradually. If you comfortably complete every set with good technique, add a small amount of weight the next time the exercise appears.
Suggested effort: RPE 6โ7/10.
You should be working, but never grinding.