Applied to Maxim online, but now having second thoughts

I applied online for a LPN "home health" position through Maxim. They called me the next mornng after I applied and left message. Then called again and left message on my home phone. After giving it much thought, I think maybe I am not quite ready for home health. I am on disability, and wanted to work just a few days a week, at my pace. I did not become a nurse until age 40. I have 5 1/2 years in psych. I never worked med-surg. Although, we did have geri-psych for awhile. And, that required good assessment skills. We were not a medical facility. If our patients had to be addressed for medical problems, we sent them out to hospital. I did have pt. with colostomy, and feeding tube. Our pts. on IV were seen by outside team. Maxim sent me an email that from my resume, I was qualified. Actually, I feel only qualified for "psych" pts. I am just finishing up refresher course. (I was not working for four years) I was hoping to learn some clinical procedures, but we were not placed on med-surg floor. It was more of a rehab type floor. I would love to shadow a nurse around to see if it would be a good fit.(unpaid, of course) Would it be okay to ask for this in interview. Saying before I make a commitment, I want to make sure that it is a fit for me. And, I won't waste anyone's time.