Well done. Walking blues was 2nd cab of the rank for me when I took up bass. 1st cab was just pedaling on the root and playing the changes. Next was the classic walking 12 bar bass...just the basic box thing. though learning the myriad permutations of a 12 bar progression took longer, (I was actually writing a 12 bar roadhouse blues tune yesterday!). I managed that soon enough but no one explained the change necessary for minor chords so I powered through years with a bit of dissonance until someone pulled me aside and taught me about flat thirds etc. It's a journey but learning everyday is the way.

Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe