Honestly, the only thing that will get you anywhere near that sound is tons of practice. There's no tutorial out there that will cover trance basslines at that production skill level. The closest tutorial would be the one that Adam Ellis did recently.
https://www.youtube.com/watch?v=DJ25FKG_4OM
agreed, hands down, all those baselines and leads that make the track are within the producer himself, this is what makes you unique
its good to 'copy' and imitate a bass but these guys will always be aahead of you cause they have their own unique vision and spin on it
so learn and shape it to your own..