lol, dude cool down don't panic
there is no "how to edit esf models" tutorial that i know of. you must learn the basics of mesh editing in 3D max, then after you do that, get the smd importer
http://mojo.gmaxsupport.com/Files/scripts/SMDImporter1-0.zip AND BE SURE TO READ THE README IN IT and start editing, then after your done go get the official smd exporter (it comes with the HL SDK, search google for it or go the verc collective site or w/e) and export your model and compile it back (which you will also need to read a tutorial about .. i.e. compiling hl models)