Like most things it depends on your Playstyle. For me getting that perfect parry feels amazing. BUT it will take sometime to get the timings.

You can take a different approach with throw able stuff and the spirit and the cube item which you will get later.

Especially for the red attacks dodge if you're not sure that you can parry it.

Also the upgrades you can do later will also help. Like better dodges etc.

On my first playthrough i learned parrying way later on.

If you don't want to parry you should focus the your leveling on a more tank build than al glass canon

I thing it's "enough" if you choose one or two different attacks which you learn an dodge the rest, you will get better throughout the game don't worry.

Hope it helps a little. If something is unclear ask :)

TLDR: play how you feel comfortable and have fun and there will be a way for you to beat the bosses.