Save your money and learn from someone who isn't playing NL200+ while you are starting at NL2.
Ask for a free half an hour preview from a guy who is winning at NL20 or something. He still can relate to your stakes and won't charge as much as someone playing way higher.
Ask him about a plan, what and how he is gonna teach you, his experience.
Get close with another student of him, work in a pair.
You will get a huge boost even after 1 session, so don't rush. Take a lesson, implement all the knowledge till it's automatic, then take another lesson. With each subsequent training session efficiency is declining.
Play a lot. Be ready to invest a lot of hours daily.
Hope this helps