Unless your soil has mineral defficiencies, you might be able to do with a 1/2 cup of cottonseed meal, compost or manure in June. During the rest of the growing season, sprinkle some coffee grounds, liquid seaweed or liquid fish. Stop all fertilizers around July to make sure that the plant goes dormant in time for winter.

This first year though, I would feed it nothing since the potting mix that it was planted on probably contains fertilizer pellets already.

Hydrangeas planted in a location where they can achieve their height/width at maturity will rarely need any cutting back or pruning. Deadheading of blooms encourages more reblooms so do this until fall. Then leaves the spent blooms there for winter interest and deadhead them in Spring. Dried out stems can be pruned in late May if they do not leaf out by then.

ES is hardy in your zone so just maintain 3-4" of mulch all year around for winter protection.

Luis