Yep, 2 hives in hand is the minimum for success. There are times when a wasp attack, or bumble attack can weaken a hive, and make it vulnerable. Having a sister hive to take some field bees, and brood, can solve the problem in a short time. It is imperative, you the keeper, open and look at the progress of the hive every week. A bit of damp burlap for the smoker, and a five minute chore should give you a good idea of conditions and production. Taken in the morning about 9-11, most field bees are out, and the hive will be depleated of number, so it is easy. A super with two canning jars on the frames, or an entrance feeder, can help with production, with a bit of boiled sugar water. DO NOT try to recycle chrystalized honey back to the bees. Much purchased honey is from foreign lands and may have spores or fungus. Bad.
Honey that has turned solid or sugary, whould be heated in a double boiler situation, and maybe commited to a honey sauce for baking. 1 cup of sugar, to 2/3 cup water and gently heat, stir, till disolved, and add what hardening honey you have, at least 1/2 cup. This syrup can be used for baking, or candied for toppings, by using a thermometer and reducing to heavy syrup, or even down to crack stage, and pouring it out on a sheet to break up. Yum! The Honey flavor will carry through.
To keep bees is fun and fairly simple. READ, read, read. And take the time to Bee a good keeper. It is not much for the curiosity and wonderment of these little animals, and the treasure they produce.