Nissan Micra 1.3 Automatic gearbox problem

Hi Micra owners, my 1999 Nissan Micra Automatic has developed a fault. It drives fine for 10 to 15 miles but then will not change up gears, will get stuck in third. I have been told that it needs a replacement gearbox. I have found a replacement automatic gearbox complete. Can anybody please guide how to change the gearbox please. What are the difficult parts of the whole job? Thank you people.
 
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