Please give me words of encouragement

Started night 1 of sleep training my 5 month old.

This morning he woke up at 9-9:15 am

First nap was 12-1:00 then he fell asleep shortly after contact nap 1:15-3:00

Then bridge nap 4:38-5:00

Bedtime being 7:00. I put him in the crib and said my mantra and he cried for 10 min then fell asleep.

He woke up at 8:00!!!! And he’s crying hard, I go in and do 5 minute check ins and it’s now 8:28 pm and he’s still crying. He has paused a few times though.