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This principle of doing the best you can will always apply in TAC. After you move on to Daily Challenges you will run into challenges that are beyond your ability. But don’t worry, these things are taught over and over again. You just try to do whatever portion of it you can. It might only be one measure or even just part of a measure. There was a time when the challenge was so difficult all I could accomplish was the rhythm, so I rested my fretting hand and just did the rhythm part with my strumming hand. The next time it came around I was able to hold down a chord while doing it and then additional chords.
You show up and try your best for at least 10 minutes then mark it complete.
After that if you still have time and want to continue, you can go at it for a bit longer. But then you should take a break, play something else and then put the guitar down. You can come back later or another day.
The skills are repeated over and over, there is no beginning of TAC and no end. Each daily challenge is a self contained lesson and is performed by players at all levels from novice to expert. A novice approaches the challenge differently and focuses on different aspects but everybody gains something.