I need some help combining front and back images into one scan

I feel like an idiot having to ask this but how do I use paint to 1 scan that includes the front and back of a card? I know I should know this but I've never had the desire to do it so I never learned. But now that I've started the T206 set I feel like I should learn. Thanks for the help.
Chris
My small collection
Want List:
'61 Topps Roy Campanella in PSA 5-7
Cardinal T206 cards
Adam Wainwright GU Jersey
My small collection
Want List:
'61 Topps Roy Campanella in PSA 5-7
Cardinal T206 cards
Adam Wainwright GU Jersey
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xbaggypants@yahoo.com
Website
My small collection
Want List:
'61 Topps Roy Campanella in PSA 5-7
Cardinal T206 cards
Adam Wainwright GU Jersey
get a scan of front to back obviously.
open the first image in paint.
use the selection tool to grab the image as you want.
select copy.
file new.
paste.
select resize, uncheck "maintain aspect ratio" and double the width -- or 200%.
save the image as new.
open the second
use the selection tool to grab the image as you want.
select copy.
file open (open your first image).
paste.
you should be able to use the selection tool (arrow) to drag the pasted portion as you see fit.
done.
blamo. (added for color)
My small collection
Want List:
'61 Topps Roy Campanella in PSA 5-7
Cardinal T206 cards
Adam Wainwright GU Jersey
Simsbury Taverneers
My PSA Sets