Canadian PR as a HS Math Teacher

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Hi all,
I am a 40-year-old Australian high school Math teacher. I have taught in Australia for 7 years and I am currently teaching in California as a Math teacher. I am considering applying for Canadian PR and living in BC (Vancouver in particular).
I checked on CIC's website and I seem to be eligible for an express entry. However, my CRS score is 418, and an immigration attorney told me that I should apply for BC PNP but BC PNP doesn't seem to have teachers as a field that they need.
What should I do next?
Should I take care of the whole process by myself or hire an immigration attorney?
Your comments and suggestions are highly appreciated.
Thank you
Param