Suggestions for my new big green maple

This tree is straight from a regular nursery so its planted in potting soil and has been for many years I would think. Therefore, I would also think that there are going to be a lot of roots at the bottom of the pot. Will this affect how I trim the roots this year or should I still chop off the bottom half and remove any large roots remaining?
 
Hi, going through all JM threads... any updates on this beautiful tree?
Pics maybe?
 
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