Question for all the independent mobile mechanics!!!

Ok guys, so im 26 and have worked at a cat dealer for 7 years and been in a field truck for over 3. I love my job but for the last year i've been getting really fed up with managment and the way the whole company is run in general. I really want to just buy my own truck and do my own thing. There is a ridiculous amout of logging business around here and i feel i would have plenty to do. me and the wife have talked about it many times and I have weighed the pros and cons several times in my head and still feel i would be happier going my own way. Just kinda worried to leave the security of a dealer job with all the benefits that come with it but dont know how much more of managments crap i can take.



One thing i worry about the most is i have really never worked on much of anything other than cat. i know its all nuts and bolts but how do you manage working on so many diferent brands, or do you try to just specialize in one brand? Would i just need to buy service manuals as i need them? I've always heard if you can work on cat you can work on anything.



Also i do have a family to support and my worst fear is that i would not get enough business for whatever reason to keep food on the table. Do you guys ever get so slow that it becomes a major problem?



Basicly if you guys could just give me a general overview of how it went starting your business would be a GREAT help! i just kinda know what to expect and what i might be getting myself into?



Thanks for the help!!!