You find like minded people to practice with. I have been on t9 since july (iirc) and have only seen a quarter of the fight after spending one month in t9. After that my group had to disband due to various reasons. We kept going and trying to find people and went through at least 3 iterations of the group. Most of the players we got aren't experienced with scob in the least and we had to retrain the earlier turns for their sake (and our sake) but it kept falling apart due to schedule changes and I never progressed any further than my first group's progress. We almost gave up trying to stick together and during our limbo period we went even further 'back' for human resources and got most of our small fc through t5 and recruited the players that are interested in scob and are willing to commit.
Our current group started about 2 weeks before vegas fanfest and by vegas fanfest they all agreed to pour in all they effort into only t9 (some of our members still dont have a t7 and 8 win). We increased the frequency of our practice to 4 days a week, 2 hours a day instead of just 3 days. We smashed our faces against the t9 bosses over and over until we progress further in the fight. There were many hurdles, especially considering we pulled half the group from barely winning t5 after practicing for 3 weeks heavily (there's only so much 2 person can do to help 6 fresh players get past t5) straight into t9. There was even a time where we pushed the t9 practice into 3 hours and we wiped twenty six times and only about 7 of those attempts managed to get to the point of the fight where we can see and learn something new instead of making mistakes during phases we already learned and rendering the attempt moot. Yesterday we got the t9 boss down to 2% HP (gdi). Obviously everyone's heart sunk at that moment but we're going in again on thursday (I so wanted to go again today).
Our group is clearly not hardcore in terms of play time or even experience but even our 'new' members' commitment to learning the fight is no joke and I personally find the 'old' members' persistence (which includes me) to be the key to us getting this far (we couldn't find the right people so we trained with them). Some of us even switched jobs to something that is far from their first choice just to make the group composition right and learned how to use them straight in t9 and geared hard after the sold cap unlock. SO, when I see people complain about not being able to even get the chance to practice even after they put in the 'effort', I have to wonder if it's even close to the effort my group had put into just to get it going.