Pleaseee hellp new member undergoing serious pool repair

Soo heres the story its been almost 3 years and my pool has been falling apart the walls started cracking a bit so instead of simply patching the bad spots i went over board and took on the whole pool. Currently I am begining to plan how i am going to repair my plaster my plan is as follows
1. Knock loose all plaster that is not attatched
2. Grind any cracks
3. Acid wash to clean
4. Prepare plaster mixture (not sure what may work best for me)
5. Paint to seal

I am located in suffolk long island ny pool is original with the house dating back almost 20 years

All help is appreciated i am 24 years old and i just want my pool back at a reasonable price keep in mind im doing all this myself and my family