I am pretty new to trials and only started as extra midweek practice for riding my Enduro bike, I feel the Trials is easier and more forgiving, anyway, I had for a long time been wanting to practice dropping off ledges safely, so I started small then moved onto about a 2-3ft ledge, the process I use is the same regardless of size.
Ride in slow, foot on back brake, get near the end, compress, lift and a little acceleration and the bike literally just hops off the ledge, I learnt the whole process in a day and spent my time hoping off every little drop I could find, here's a little video showing the drop I was using, I know it's to flat but the process is the same
https://www.youtube.com/watch?v=y2dYv6EufZI