Do not offer to take over and then ask for supervision at every step.

Taking something over means taking the thinking with it. When you claim a job and then return with a question every twenty minutes, the other person is still carrying the task, only now in pieces and without control over it. That is often more tiring than doing it themselves would have been. Relief comes from not having to hold the thing, not from being spared the physical part.

When you take something on, gather your questions and ask them once at the start. Then decide the small things yourself, and accept that some will be decided differently than they would have been.