I don't want to discourage you, but even at the time with TDIU, it took me my 3rd appeal (technically 2nd) and about 10 years to win my SSDI claim.
I was so let down by the first loss that I gave up. In doing so, lost out on a lot of retroactive back pay as time lapsed between the 1st and 2nd claims to only get a partially favorable decision the 3rd time to the date of the 2nd claim. Had I just pressed on and appealed, I would've walked away with heavier pockets.
Keep your spirit high, but stay grounded in reality. If things don't go as imagined, it will be hard, but you can manage. Just keep pressing on.
Hoping the best for you!