If space is tight, consider using a panel saw to cut large sheets down to smaller sizes instead of setting up to handle them full size. When building overhead shelves, consider that a comfortable vertical reach is from 77-in. to 88-in. Normal horizontal reach ranges from about 15 1/2-in. to 20-in.
Recessed light fixtures can be a major source of heat loss, but you need to be careful how close you place insulation next to a fixture unless it is marked. “I.C.”—designed for direct insulation contact. Check your local building codes for recommendations.