If you weren't ready, on some level, you wouldn't be here asking questions. At your level, the first sign of a professional is someone who knows their limitations and seeks assistance when its required. If your aquatics skills are strong, I'd wager a guess you're pretty close to ready.
Buy the Encyclopedia and read it five times, complete the workbook twice, and re-read all the manuals (OW, AOW, Rescue) a few times each. Watch the agency videos, practice the 20 skills in confined water, view demonstration videos on you tube a few times, and then do all three exams (A & B) until you don't get any wrong.
Now you're ready.
Buy the Encyclopedia and read it five times, complete the workbook twice, and re-read all the manuals (OW, AOW, Rescue) a few times each. Watch the agency videos, practice the 20 skills in confined water, view demonstration videos on you tube a few times, and then do all three exams (A & B) until you don't get any wrong.
Now you're ready.