Could someone give a thorough explanation on how to skin because the tutorials don't make any sense whatsoever. And use small words I'm a little slow when it comes to PCs

I want to skin for Jedi Outcast

-Using winzip or winrar, extract the big pk3 files found in JO's base directory. Once extracted, browse the models directory you will find original textures (in jpeg or tga format) for every character/object/weapon.

-Open the jpeg or tga file you wish to modify in photoshop, start painting over the details with your own design, colors etc. To preview your changes, load the character into modview and hit alt-r (i think) to reload any changes you have saved in photoshop.

I could use some help right about now so far I've got everything pretty much ready I just don't know how to convert it to the Modview format and look at my skin could someone please help me?