I use a password manager, but nothing phonetic.
The password I use is just a random mash up of all characters, maybe 30-50 characters long.
I think it's possible to remember more or less any password, if you use it constantly, multiple times per day and every day.
I've forgotten complex passwords, that I've not used for ages. If you keep using it day to day, you'll be fine.
My advice would be to write the password in a text document to start with, as a backup.
Once you're used to typing the complete password from memory, delete text doc.
Sometimes it's easier to remember passwords, if your hands move over the keyboard in a flowing pattern and not going from one end of the keyboard to the other end and back again.
Edit:
I'd also recommend encrypting your "C" drive (with a different password).
It's possible to download software, that can reveal passwords in seconds (I'm not sure if that applies to password managers), but definitely to email clients and other software.
Which might make a "complex" password irrelevant, if the drive isn't encrypted and your computer is stolen.