Agree with this flyingmed and bulldog89, you have to really really want it and have the non waning passion of Valentino Rossi to want to keep ongoing despite poor pay, being messed around, giving up your freetime often and paying for so many things yourself even when employed.
Its hard to know what its like until you have tried it but the older you get the harder it is to accept being treated like this, I found the airport security a real hassle, complete jobs worths alot of the time and a rubbish way to start your day!
I would recommend working in an airport for a week or two to really sort out if you want to spend so much of your time there, I guess the drop of rate would be high and you could save alot of your time and money.