the recording bit is mainly about macros, if you go on F1 type in macros that may help you.
when i changed the colour of mobs i just did each one seperatly.
exported the will into a folder on my desktop, then after i changed all the colours you then import the folder into the wil, look at the last number for example 1200.wil, then make a new one 1201 and import your new mobs there (if i remember correctly)