Right from the beginning I started with a curb mount. (I still start my usual ride from outside my house that way.)
Then I tried the roll back which seemed to require the unlikely ability to ride backwards, even briefly. Then the gravity defying step up which seemed implausible. I decided both techniques were being explained by riders who had forgotten the difficulty of learning and started working on my own technique from first principles.
I came up with something less refined but essentially similar to UniMyra’s classic video linked earlier in this thread. As I posted on UniMyra’s video thread, the only improvement I could suggest was that he had posted it a couple of months earlier. Anyway the video really helped me advance.
I began by holding a fence as I tried to balance the forces on the pedal and saddle. I would grip a post and run my forearm along the top rail, providing resistance to both rolling and twist. As I got control of the twist I graduated to just holding signposts, relying less and less on them until I didn’t need the support any more.
Consequently, for me, a static mount was a somewhat inevitable starting point. I continued to experiment with the saddle versus pedal pressure, especially as I upsized unis, realising that the roll back and rolling mounts were really just variations of the same mount with unbalanced pressures.
At the time I was normally a “handsfree” rider so I held the fence with my dominant right and the seat with my left hand. Consequently I still free mount holding with the left and then swap to my right hand on the seat once I get going. I should make some effort to change this I guess but it isn’t really a problem where I ride.
How long did it take? I started riding in January 2014. UniMyra’s video was that July. In the 10 km race at the Australian championships in October, it took me several attempts over half a minute to successfully mount my 24 at the starting line as everyone else rode off.
Free mounting is very useful but I advise that new riders don’t fret too much over it. It will come more easily as other skills develop, particularly the momentary still stand.
One suggestion is to try mounting a bigger uni. Everything happens so slowly on a bigger uni so the technique is easier to understand, although the effort increases because you must jump higher. Mounting a smaller uni is a breeze afterwards.
Also note that will smaller unis, the mount is more or less a single action. On my 29 I find that I need to actively adjust for side balance during the mount because it takes a relatively long time.