Make sure that you keep clipping into a series of backup knots as you ascend. Backup knots work well when a rope is not anchored at the bottom end. If you rope is anchored then you should set up a prusik knot right above the bottom ascender. Make sure you

A properly installed screw-in step is as stable as the tree is strong. They are rock solid. However, because of the mounting time and effort involved, they are best used if you know the stand is going to be in one place the entire time.

Tree climbing, the sport, ... The Prusik attaches a loop (the white cord in this photo) to the climbing rope, providing a tool to help the climber ascend. You stand up in the loop, ...