I would agree with sevenstrokeroll's suggestion - Stick and Rudder helped me massively, as it really got me to understand Angle of Attack and its importance, plus a few other things. It is quite an old book so there's a few bits you can probably ignore at this stage (all the bits about tailwheel aircraft etc, which were the norm for training when it was written), but everything else about AoA and use of rudder etc is valid on pretty much any aircraft.
Taxiing wise as others have said you might be over-controlling - try looking further ahead (I remember that helped me get my take-off rolls under control when I started doing them, as these were initially rather wobbly).
Finally, in terms of hours - I think the big thing is that while most of the circuit is fairly straightforward (well, once you've done it a good few times so it doesn't seem like everything is happening at once like it will at first!), the actual landing is the tricky bit, and essentially that will take a different amount of time to 'click' for different people - if it happens very quickly, then you can solo in a short time, for others it takes longer. I seem to remember I did my first solo around 20 hours in, after what seemed like forever doing dual circuits - ultimately it doesn't matter - the more time you have in the air the better.
One minor note is that while lessons might be nominally an hour, you'll probably find some of the earlier ones only being 40-45 minutes, as any more and you likely end up overloaded and won't learn anything (particularly early circuits lessons), so that might help to explain how 10 hours or less is possible in some cases.