I used to have a sayingabove my signature that said, "Experience is a tough teacher because it gives you the test first and the lesson later." Whatever you do, you will learn something and that is the point anyway.
I like your Murphy's Law. The ones we used to quote when I worked were the more classic:
A. Nothing is as easy as it seems.
B. It will take longer than you allow.
C. Anything that can go wrong, will and at the worst possible time.
D. If something cannot go wrong, it will anyway.
E. Interchangable parts aren't.
F.Nothing is foolproof because fools are very clever.
G. If one of several things can go wrong, the most catastrophic will.
H. Things will generally go from bad to worse.
I. Chance favors the hidden flaw.
J. If you can keep your head while all about you are losing theirs, you have overlooked something.
K. Parts will break or be destroyed in descending dollar value order.
L. Every problem solved breeds two new problems.
M. Whenever you set out to do something, there will always be something that you should have done first.
N. There is never enough time to do a job but always enough to do it over.
O. When in doubt, mumble.
P. When in trouble, delegate.
R. Anything put in a safe place is gone forever.
S. Your best golf shots always occur when you are playing alone.
T. Your worst golf shots always occur when you are trying to impress.
U. Having the "Right of Way" does not make you less dead.
V. You will get not credit for what goes right.
W. You will get all the credit for what goes wrong.
X. You will always find what you are looking for in the last place you look.
Y. Nothing is impossible for the person who does not have to do it.
Z. Never attribute tomisfortune that which can adequately be explained by stupidity.