It happens to us all sometime - we want to move a plant - perhaps it's grown too big or it would look nicer elsewhere.
Whatever the reason if we want to keep it, moving it is a problem, with no guarantee of success.
Plants take in water through their roots - so to simply uproot a plant could lead to dehydration and the death of the plant. We need to dig the plant up with as much of the root system intact as is possible.
To do this we have to use a spade and cut a circle in the soil a distance out from the plant to be moved. The distance will vary depending on how long the plants has been in position.
A rule of thumb would be to make your circle the same diameter as that of the plants branches.
It will be easier to move a younger plant than an established plant.
A young plant's root system won't have grown outwards much from the original root ball while an established plant's root system could have grown out several feet and a tree's several yards.
Always move a plant in late Autumn or Winter when the plant is dormant. During dormancy a plant takes in very little water, if any, so dehydration is less likely to occur.
A deciduous plant will be dormant once it has dropped its leaves.
An evergreen plant never goes truly dormant and always has a need for water so the success rate in moving an evergreen is not as great as it is with deciduous plants.

Anyway, dig your circle round the plant a few weeks before you intend moving it to give any roots damaged a chance to heal.
Then work your way round your circle pushing your spade under the plant to cut any roots growing downwards.
Allow a few days for the damaged roots to heat then ease the plant up out of the ground.
If you meet any resistance then there are still some roots that need cutting - use your spade.
Lift the plant and move it to it's new position for planting.

For very large plants digging a trench round the plant would be better as it allows you to dig deeper and keep more of the root system attached to the plant.
For larger plants you will have to dig your circle further out.
Again for larger plants you may need help to lift it and move it.