Very disappointed and confused about a ranking drop? Please advise.

I developed a bloger blog that was moving quickly up the rankings for a specific keyword. I was doing some research and followed the instructions on this site and edited my Cutom Robot.txt and Cutom Robot tags. This morning I woke up to a rankings drop of around a page and noticed that 63 of my URLS have been blocked from being crawled?
I am new to this and am unaware of what is going on? Should I go back and disable custom robots.txt and custom robot header tags?
I would appreciate any and…
Very disappointed and confused about a ranking drop? Please advise.

See original post by Lawpre