I have done strength training without a coach for 6 years. My squat went up to 185kg/407lb without any injuries. You can do it, and depending on the coach, you may be better doing it alone. However, with a good coach (not easy to find) you will progress much faster. I recently started competing and found a good coach, I wish I had found him earlier.
> However, with a good coach (not easy to find) you will progress much faster.
In what way coach is helping? Providing that your technique is correct, application leads you - so what's the coach's role?
Every work set she’s watching me and making frequent adjustments. It would be impossible for me to do this without her. Maybe I could record video and analyze it, but I would have to essentially learn all of her expertise and even then it would be delayed so I couldn’t make fixes until after I have already completed a dangerous set.
At the very least I would recommend a good two months or so during your linear progression. After that you can do volume sets, pause sets etc alone, with coaching maybe twice a month for heavy days and to check in on your form.
(Shameless plug for Bay Strength in Berkeley CA!)