Water well the evening before you dig - this will soften the soil and enable the rootball to stay together). Cut back as much as half of the top growth (in your case, leaving a 2foot cane ). Dig a deep trench around the perimetre of the rose, as big as you think 2 people can manage to lift with forks or spades). Slice horizontally, as deep as you can, freeing the taproot then using 2 spades, lift the rootball onto the burlap, wrap well, pour a can of water on the whole wrapped rootball and transfer to new home.
New hole. A nice deep hole, with, if possible, some good garden compost added to the soil taken out of the hole. Puddle in the new rose (add water to the hole and allow it to drain away), plant and backfill, throwing in the drier soil first to ensure it settles between the rose roots. Tread the backfilled soil in firmly with heel of boot.
If the rose starts to look a bit wilty, try covering with an umbrella or parasol or other shade material. You will need to deep water (at least2 gallons every week or so) for the rest of the season, by which time the rose will have made new root growth and be able to survive with only minimal (if any) extra irrigation in following years.