So you want to decompile a mod eh?
Step 1 Get bearded Octo nemesis, it will deobsfucate the code (Note: The input and output folder both need to be zips)
Step 2 Get jdgui and open the output zip with it
Step 3 in jdgui in file there should be an option called save all sources, press it
Step 4 open the zip jdgui makes, and drag all it's contents into your src package from eclipse
Step 5 Your done! Now pat yourself on the back and give me a thank you since this is hard to obtain information
Notes/Warnings
Note: in bearded Octo nemesis, the Mcp folder is used for the deobsfucation so choose the folder appropriately
Note: go into the properties of beard Octo nemesis and disable security on it(you need to do this otherwise your computer won't give it access to the input file, and it'll spit out an access denied error)
Note: This is not perfect, there will be quite a few errors in the code when you dump it into eclipse, fix them appropriately!