Hey - no harm in going slow...staring at walls sometimes, beats making mistakes. I think the biggest thing I have learned in the past year is taking my time and not wanting instant results. I did the trany flush on like the coldest night of the year, garage was freezing. Got all the parts off, things started shrinking and then they didn't want to go back together so easy. I learned trany fluid is the worst smelling thing in the world.
And on the jacking the car up...I still hate that part the most, everything else is getting easy, just something about the left wall being so close to the car. From the pic looks like you got up pretty far. I use carpet pad to roll around on, beat the cold hard concrete. The roller is too high sometime.
Oh and I stare at walls sometimes too when working on the car. Thinking time is always good.