At 1st I thought better stack up on the heavy armour then try out the heater shield...but I found that when I don't feel like there's a consequence to missing the parry I just get carried away and miss my timing and only have decent success.
So lately at the kiln I do it naked with just my Dark mask the heater shield and velka rapier/bandits with the hornets ring...so you will pay dearly for your mistakes...I find when your low on health and your back is against the wall this is when you can fight the best or at least I can...I have had great success with this technique the last little while.
At lunch today I went home fired up dark souls...1st guy I fought buffed a CMW claymore I gulped stepped up and nailed him with a parry 1st strike he tried for a OHKO...then I even got a prediction parry on a uchi a couple fights later. Its not for everyone but if ya wanna get better you have to think outside the box sometimes and die lots lol!!