Page Speed

I need help on how to fix problems problems directly on my site. I am not a web developer/designer, but managing our company website. I have gone through Hummingbird and feel I made changes I am capable of. I need help specifically with: Eliminating render-blocking resources, Minimize main-thread work and JavaScript execution time (I am receiving the following error Error: Fatal trace logic error – expected start event, got X), Ensure text remains visible during webfont load, and Serve static assets with an efficient cache policy. When I grant access, can someone go to my site and make the changes required?