Is phlebotomy a good option for someone with just a high school diploma?

I didn’t do particularly well in high school, especially with math and science. I’m 23 and haven’t pursued any type of education (college, certifications). I decided something has to change and have started considering phlebotomy, i wanted to know, is phlebotomy easy for someone to step into? i’m worried i’m not intelligent enough to understand what i will be learning in the program, is there anyone who stepped into the field with nothing besides a high school diploma?