I got the plans wrapped up and went down to the city to pull the permit. Corona is very high up on my list of building safety departments that I completely detest.
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Once the patio design is finalized that will be another permit in addition to one for relocating 2 A/C units and another for a small retaining wall. Corona requires any wall over 2' to be permitted
I have done my own plans for over 10 years now. The only formal training I've received was a high school elective drafting class and that was nothing more than the basics. I've been blessed to have a good family friend that is a structural engineer that provides all the calculations and mark ups on my plans.
He would surely tell you I've come a long way from my first set of plans. I recall him laughing hard enough to spit coffee all over them.
For pools I use Pool Engineering Inc out of Anaheim. I've dealt with them enough that I can do all of the structural callouts for them and they only need to provide the specific detail sheets.