Some people find it challenging to do this job with minimal education. The answer to this is to ask a lot of questions, read journals you find at work (or the library) and generally show your co-workers that you want to learn more . They'll teach you once they see your interest. This really helps someone who's working their way up the ladder toward better jobs.
Some people find the pay to be a challenge. The internet is full of ways to live frugally. No it's not fair.
Some people find the work itself to be less than pleasant sometimes. You have to get very personal with the patients in some settings, like giving showers or bed-baths. You might not enjoy cleaning up bodily fluids. People working in hospitals & nursing homes have the worst of this, bless them. In a doctor's office it's generally less intense. Your workplace will supply the protective garments & equipment but someone still has to do the work. Consider this carefully before starting school and before applying for jobs.