Two things:
1) agree with stumpdog. I took my LSF word for it back in '94 - my first try. Eventual disaster. Then, just last year when I decided to try it again on LSF word. I found this site about 6 months into it. Too late I am now starting over.
2) Not putting in the proper time to research. Like above, I am paying for it now bigtime b/c I figured the guy in the store knew everything. The comparison between here nd my LSF is not even possible, not even close. Based on the research I've done here on this site, I know at least 10x's more than I did this time last year.
PUt in the research up front, be it word of mouth, books, LSF, or the internet. I did not do this and paid dearly...twice.