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At this point in time, I would leave the pruning till next year, just so you don't inadvertently bring the plant out of dormancy.

I don't think that the hemp over it will help much, as that is more to protect from wind and drift damage, but you can use the hemp to create a barrier around the plant that you can then fill loosely with leaves for added cold protection.

Fall is the best time of year to move a Hydrangea.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/transplanting-hydrangea-bushes.htm

It is possible to move in the spring but you will have to be very diligent in watering and care.

These articles discuss the basics you need to know: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/deadheading-a-hydrangea.htm

We do not. I am sorry. When you do have internet, I think the best thing would be to check Amazon. They will, more than likely, have what you are looking for.

Can you include a photo? This could be due to many reasons. Many times, even thought these are marketed for full sun, they will appreciate some shade. This is especially true for hot, and dry periods.

A photo will help me to determine the exact cause of the spots.

Limelight hydrangeas only bloom on new wood, so any heavy pruning or cutting back must be done in late winter or early spring before new growth emerges, since pruning at any other time of the year will disrupt their normally flower display.