Very interesting to see progress and compare it with my own 
My story is a bit different (sorry for log post):
Learning alone on QuAx 26" in the mornings. What I did - read a lot of forum topics and watched videos. It happend this spring, so memories and fillings still fresh 
Before starting outside I learned mount near wall and riding holding the walls in my apartment (without furniture - just bought it) for about 2-3 hours in total.
Have no any success even in riding 4 meters. I think it because of walls - I was trying to reach (and hold on) the wall, riding was not an aim in that “falling-forward-thunder-speed-hyper-jump”.
After that I started my “workouts” outside…
First day (one hour) I was trying ride along high fence (made of steel rods) and found that not really good because I have to see where I putting my arm.
Second day (one hour) figured how to place foot on pedal (before I was doing it like on MTB), found flat place with curbs and building corner… started with “step over the unicycle” exercise, then some tries to ride from curb pushing from building corner. With pedals in horizontal position. Max about 2 meters.
Third day (one hour) continue step over and curb + corner starts. Max about 4-6 meters in ~5% of tries.
Fourth day (one hour). That flat training place is about 10x10x10x10 meters with outgoing uphill road and turn - to the right side more steep uphill and to the left side flat road. So this day I did my first 100 meters without UPD and mounting from curb without wall.
Fifth day (two hours) riding about 500 meters on sport ground and ~30% of success free mounts.
Sixth day (hour and a half) ~50% success free mounts and first 4km ride on sea shore (with lots of UPDs of course).
So it was about one week of ~10 hours trainings.
Key moments I learned are - correct foot position on pedal. Leaning forward with “belt buckle” area. Put seat as high as possible (absolutely straight legs) and then lower it on 0.5-1cm. Do not try ride straight (this is strange and you think that you UPD becose of that, but no and this helps a lot).