Upgrade from 1.80 to 1.90

This will be the first upgrade that I have done.  When upgrading do I just load the new files over the old one's?  Can someone please direct me in the right direction.  I had my hosting company install it on my site for me the first go round, but it is an arm in a leg to get them to do it again.

Thanks,
Josh

hi Josh,

have a look at this video

http://www.youtube.com/watch?v=WBjv4aHQeNE

Please take a look at these threads:

https://www.nopcommerce.com/boards/t/6072/help-in-upgrading-from-16-to-18.aspx

https://www.nopcommerce.com/boards/t/7390/upgrade-from-110-to-180-issue.aspx

https://www.nopcommerce.com/boards/t/6827/upgrade-15-to-18.aspx