Been there, done that, got the tee-shirt !
So, and in no particular order (accept for the very first of these)......
Never ever forget to put the money that you will owe the taxman aside - i.e. don't go and spend it on your Instrument Rating, or some such (like I did) !!!!
Now it might sound weird, but you can end-up being a victim of your own success, i.e. having job offers coming out of your ears, and in this event a degree of integrity is always a good thing to maintain.
Similarly, try to make time for your family (which is an area where I too really need to take some of my own advice). With their support you can work all the hours that god sends, but if 'her in doors' starts to get p!ssed off with you working 14 hours a day and having no time for her, or the kids, then you will rue the day when she rebels against you !
It's often said in contracting that you should try to avoid saying that you don't know how to do something, however you do owe it to both yourself and your client (employer) to deliver what was asked (and paid) for - i.e. be very careful not to over sell yourself.
Don't let your success with IT get in the way of your flying aspirations - the longer you leave it ,the harder it becomes to break into aviation.
Just like flying, you should endeavour to maintain your IT/systems skills in tip top condition - i.e. should be you ever lose your license (e.g. stuff up a medical) you can always go back to this much-in-demand job.
Just like many other business's, airlines too are desperately short on solid IT skills and imho this is a good selling point on your CV. Indeed, and almost as proof, yours truly is due to become the IT/Systems Manager at British World Airlines, whilst also flying the B737 for them from LGW, i.e. veritably the best of both worlds !
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CrashDive
Administrator to The Professional Pilots RUmour NEtwork
May you live in interesting times !