Manual is the name of the game in editing.
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This is generally an area where After Effects excels but assuming you don't want to go there, I can suggest using the 4,8 or 16 point garbage mattes in Premiere Pro to trim out the bits of the image you don't want.
Just put the clip on track 2 and move/resize to suit.
Thanks to all for your help. I will try After Effects and if it fails, I will stay with the the resize and move.