If you are in a league with strict roster/draft requirements like mine, then wait until the very end for kickers.
My league only allows 1 free WW/FA move, every one after that starts costing money ($2 then $4 then $6 and so on).
So, in order for us to not be forced to use a FA move on bye weeks we have to draft 2 Ks and 2 DSTs. We also go 20 rounds with 5 RBs, 3 QBs, 6 WRs and 2 TEs.
Now, where do I draft my 2 Ks in 20 rounds? Usually rounds 18-20. I will onloy jump up to round 18 to take my first if there is a "good" one sitting there.
I also take my 2 defenses in the 16-18 rounds. I never will use a 10-15 pick on a defense like many guys do to get the Chicagos or the Baltimores of the defense world so once they are gone I'm relegated to choosing defenses with the "best" schedule (play the weakest offenses). At that point they will be available in the late rounds, no doubt.
Choose all of your offensive players before you choose any DST or K.
For instance, last year I got guys like Maurice Jones Drew and Jon Kitna in the 2 rounds just before my Ks and DSTs. Those guys started for me at times last season and they were drafted in the 15th and 16th rounds.