IceNurgle is just being a hater.
If you aren't feeling comfortable in Ranked droping down to Normal for a little while is a fine idea. Try to do draft instead of blind so you can get practice with banning, counterpicking etc.
Some general benchmarks for getting ready for ranked:
Are you comfortable with draft mode?
-bans, counterpicks, team comp, dealing with trolls (dodging is not always the answer)
Can you play each role?
-have a few (like 3 or 4) champs for each role, know common matchups in each lane
Do you have runes for each role?
-AD, AP, support, jungle
Can you stay calm under pressure?
-rage is never helpful
Do you know common tactics?
-when you can take baron safely, when you can safely take dragon, when to push/splitpush, when you can invade at the begining of a match, when they are likely to try to invade you, how to bait/not get baited, why wards are op... kind of a long list of things here ya know...