Re-lay and level part of a patio

It is possible, gently left then out of place, chisel out the old mortar bed and fill with fresh cement and re set the paver

Yes it is Carefully take up and stack the slabs in a safe place Remove the old mortar Make up a new mix of mortar, I use 4 parts of sharp sand to 1 part cement and relay Checking levels as you go To repoint I use building sand and cement with mix ratio as above

Generally yes. However, if they were laid on a Wet mortar mix then it will entail cutting the bed out in order to create space for a new bed. Bricklayers and DiyTommy Walsh lay on wetmix which is fine until there is a problem. Properly trained Paviors lay on a semi dry sharp sand/ cement mix which provides a solid bed but allows for repairs.

Definitely possible would need to be very careful when lifting and cleaning the old mortar from the back. Clean out joints first to create room for movement then lever from underneath with a nice wide bolster. 👍🏼