Thanks to my friend siframe for this quick and useful tutorial!
1) unzip lnk reshuffle (duh lol)
2) go to the version folders inside the Lnk folder- 1.02, 1.02a etc, and open the one for your game version. put the dinput.dll into your game directory
3) open lnk reshuffle with the start bat
4) select the STEAM original game exe in the top bar, the 3dm launcher won't work but your adjustments will still show when running the game from the 3dm launcher.
5) select a character from the first drop down which defaults to 'Akira'
6) select the costume you want to switch from the next drop down across - default 'cos_001'
7) highlight the tmc in the list that appears in the left hand box, then press 'swap' on the bottom right
8) navigate to the mod tmc you want and press open. Lnk will think about it for a second and then if swapped successfully the font of the selected tmc in the left hand box will go dark red rather than black. Repeat for the tmcl, no need to worry about any of the others.
9) When you've swapped everything you want to press quit. You're done.