Of course it would be nice to have a sound guy. But I think if you really learn to use that board properly you should be able to find a much more efficient work flow. Once you have dialed them in... if you are always playing with the same guys, you should be able to set and forget all your channel settings. As long as stage volume isn't as issue you should be able to use the same exact mix at every show. All you should have to do is adjust your master level and master eq for the room you are in. If you want a different mix from song to song that is fine... just work that out in rehearsal and save the scenes on the board. One button or one push of a foot petal can switch you from song to song. Your band mates need to learn to do there own monitor mixes. There is no reason not to.