If the question is what is the strategy to reach it safely because you would just like to see the TABA mode, then the method would be along the lines of the following below. It is NOT very good for points and is NOT the way to play the game IMO, but if you are frustrated and just wanted to see the TABA prize:
1. After a skill shot to a controlled flipper (example shoot tower first), shoot the ball into the ring to start a mode. The mode start is lit at the start of each ball.
2. Get the ball under control, cradle, let mode time out. Don't risk taking any shots that will make you drain. (Boring? Yes, but I am assuming you want to see something new later down the road. You probably have already seen all the modes individually)
3. To relight the ring, you can either a) shoot the ring 3 times or b) relight the 3 elf ring circle (which lights the mode start) by hitting the associated playfield shots. If you hit the shot where the white elf light is lit, then the other shots light white briefly and you can collect a double elf ring, which will complete the 3 you need.
As a motivator, again keep in mind that the mode start is lit at each ball, so tell yourself that you only need to complete this task once per ball on 3 ball settings (until the final step). Give yourself smaller achievable goals, don't focus on the enormity of the larger task.
4. Hit the main ring, start mode and repeat the process until the 6 are lit. Do not worry about using the flippers to set up a particular mode or stacking with multiballs. Multiballs DO NOTHING to help you "reach" TABA. The modes cannot be played twice before TABA, so you will not accidentally play the same one twice. Just concentrate on making the shot to the ring. (Again, to the advanced player, this is just focused on the player reaching TABA, not scoring mega points or reaching Valinor or lighting gifts.)
5. At this point when all 6 modes have been played, the 6 red lights above the ring will strobe slowly. The ring now cannot be hit 3 times as before to light the mode start for TABA. The rings must be lit from the shots on the playfield.
6. Once mode start is lit, hit ring and start TABA and enjoy the music and the mode.
7. Celebrate and post your achievement on the groups
There is a lot to do to reach TABA, but depending on your skill set, that will dictate decisions you make. Some players will be screaming at the advice I wrote. What about this, and that and stacking and gifts and...Everything I just listed above is ONLY about helping someone reach TABA, but it is extremely inefficient in the quest to Valinor and is NOT a very fun way to play the game.
But if the player reading this is having trouble reaching TABA, then I suggest they ignore the tips on how to reach Valinor, since that is too advanced of a goal right now. Get the basic mechanics down first and at least convince yourself that you CAN reach one of the Valinor subgoals.
As I said, the list is NOT very effective in points, and NOT a good way to play the game as a whole. I have many strategies on how to play and reach Valinor, but since someone is asking how to reach TABA (not the rules, but a method), then I don't want to confuse the issue As the player becomes more skilled, they will develop strategies and more risk-reward scenarios.
Regarding extra balls, there are TONS of them available, but the methods to earn them can detract from the goal of reaching TABA.
Enjoy!