Posted: 2012-07-06 11:08
This was the most difficult part for me too. From here on it varied - some chars had similar impact, while others were relative easy.
And about getting easier: at my first pass of all koch lessons, I practiced typing what I heard, not writing. I found this inconvenient since it would not allow me to take a pencil and start writing what I heard on the radio. So I had a second pass at the koch lessons, writing down. Still took some effort to link the sounds to my writing, but new lessons did not mess up what I learned before.
Bottom line: it won't get worse and even better at some chars and you are already more than halfway learning all sound patterns. Stay with it!