u dont necessarily have to use a host trainer. u can use the force host console command
party_hostmigration 0; party_connecttimeout 1
so when u got yer mod and yer rdy to set up. go to yer console, type
fs_games mods/MODNAMEHERE <----- name of mod folder
then type vid_restart
than force host with the force host command or start a private server and yer done