I don't think you'll have any problems fitting into PDN. Since you do have a little med-surg background, that will just make it easier.
When I graduated from nursing school in 1996, I landed my dream job in OB immediately. I worked there for two years until the stressors of hospital work got to me. That and the fact that I was having trouble conceiving my 2nd baby and working day in and day out in OB wore me down mentally. I quit my OB job and that same week became pregnant with my #2 son. I then took a ten year break from nursing and became a stay-at-home mom. My second son was born with special needs and his first year of life was nonstop medical interventions so I did use my nursing at home on my own kid.
Then, August of 2009, I got a call from an RN friend of mine whom I knew did PDN but I really didn't know the details of it. She had forgotten that I was an RN and recently remembered. She had another RN going out on maternity leave and asked if I would join her pediatric case. Well, it took me two months to actually decide that yes I would try it. I was so unsure of myself. I hadn't worked in over ten years and my hospital experience was only two years in OB. I definitely felt inadequate!
I trained side-by-side with my RN friend for what was more than necessary because of my fears of being able to do the job properly and would I remember everything?
Here I am, one year later, still with my original peds case but also have an additional adult vent client as well. I actually enjoy doing PDN so much more than I did working my dream OB job in the hospital. Yes, the hospital experience definitely helped even tho it was so so long ago. But working PDN, you really do learn on-the-job, learn to problem-solve. I sometimes think of it as kind of "glorified babysitting" altho I know there is more to it than that. But some days are so easy, that that title does fit. That's not to say that my RN training doesn't come into play because it does. Just a week ago, I had my worst night shift ever with one of my peds patients. She had leg muscle spasms for 3.5 hours during the nite and then her sats began to drop. You always have to be on the ball and sharp in case of changes in the patient's condition like that.
If I can do PDN with my RN history behind me, I believe you can to. I really enjoy the flexibility of PDN and being in the home doing 1:1 cares is the best. I couldn't imagine taking care of 8-10 patients at a time today; I definitely could not give the kind of care that I give now and be happy with my performance.
Have you gotten a job in PDN yet? Let us know what's going on!!