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Step by step if you're still having trouble:
Open Big Image
Resize if necessary
Press 'M' or otherwise select rectangular marquee tool
Set dimensions to 'Fixed Aspect Ratio'
Set Aspect ratio using boxes 2 and 3 respectively for 100x150 thumbs
Select area you want to be the thumbnail ( with rect marquee tool )
Ctrl + C to copy selected area
Ctrl + N to create new image, the dimensions of the copied area will be pre-filled
Hit Enter
Ctrl + V to paste copied area
Image -> Image Size
100 and 150 in size boxes
Retouch, sharpen, brighten as necessary
Ctrl + Alt + Shift + S to 'save for web'
Mess with settings to optimize quality vs. filesize
Save
This is basically what my macro does except it resizes the original image to the dimensions of the thumbnail and then the thumbnail created in the above steps is copied into the original image so that when I save it has the same filename ( saves to different directory of course ).
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