I will start off by saying my suggestions are very southern Maine centric, so if you are going to be in a different part of Maine this may not be super helpful.

The first thing to do would be to make sure you have your GED or High School Diploma. Then go to a lab website and find a tech position. Nordx operates the Labs for all the MaineHealth hospitals and has tons of openings, here is an example of a posting.

https://www.careersatmainehealth.org/jobs/1350029-anatomic-pathology-technician-histology

The job description will say prior Tech experience preferred, but you definitely want to make sure your resume has things on it that point to you wanting to work in healthcare. Volunteering at hospitals, or non clinical jobs in the healthcare field would be a great thing to have on your resume to show that. So would college or community college level classes on Health Sciences or Healthcare Administration.

Another option would be to start as a phlebotomist, working at a lab clinic or hospital drawing blood. This is a direct patient care role, but is often a good inroad to a lab carreer. SMCC has a 6 week fully paid program where you can learn to become a phlebotomist.

https://my.smccme.edu/ICS/icsfs/Phlebotomy_221115.pdf?target=2dea6825-44e6-4429-bf41-f76919df0555

I hope some of this helps. Maine does need new blood in the workforce, so good luck!