Best way to "get experience" for T5?

[Slick]

1.) Watch a bunch of YouTube Video Guide to understand all the Mechanic. ( Which you already did. )
2.) Start using Duty Finder to get your feet wet. Do it to get the hang of it.
3.) Start using PF to recruit for Clear Party. Most will not join a Learning Party due to their time and patient have to deal with newbies.
4.) Getting making a LS and invite people that have patient and have similar goal to push through the content together.

If all failed, join a good FC that can either carry you, or come with 7 exp people to teach you and get you through the fight.

Thank you!