Congratulations! 
http://lowendmac.com/oldmac/compact2.html and http://www.preterhuman.net/texts/computing/Apple_Service_PDF/68k_Macintosh/macintosh_se.pdf will be useful for the hard drive.
If you had never ordered a hard drive upgrade or have had somebody upgrade the hard drive for you, this is what the hard drive should look like.
For the former, find the section on "Picking a Hard Drive" and "Installing a Hard Drive", which includes clear photos of where the hard drive is. For the latter, find the section that is simply called Hard Drive in the Part Replacement section.
Good luck! Be careful too.
-JRL
http://lowendmac.com/oldmac/compact2.html and http://www.preterhuman.net/texts/computing/Apple_Service_PDF/68k_Macintosh/macintosh_se.pdf will be useful for the hard drive.
If you had never ordered a hard drive upgrade or have had somebody upgrade the hard drive for you, this is what the hard drive should look like.
For the former, find the section on "Picking a Hard Drive" and "Installing a Hard Drive", which includes clear photos of where the hard drive is. For the latter, find the section that is simply called Hard Drive in the Part Replacement section.
Good luck! Be careful too.
-JRL