Go for it!!! Just make sure your programs are COMPLETE curriculum, and won't max out your financial aid!!! I have been noticing in my area how schools are missing Peds and/or Maternity classes and some who are MORE expensive than RN programs...DO YOUR RESEARCH.
Also, get help ASAP if you don't understand. If you already a CNA and your struggle and cannot make it in the program, you CANNOT transfer into an RN program, I believe....It may be relative if your prerequisites are good, but I remember a classmate that did not do well, although their prerequisite grades were really good..some RN schools have the thought if you cannot do well in a LPN program, your are going to struggle in the RN program.
I got my LPN because I had test anxiety and did not pass in RN school the first time. Returned eventually (worked for 7 years) and got my BSN in May. Just giving a dose of reality for someone who's been through the trenches. With that being said, I wouldn't change my path if life for NOTHING! Good luck all !!!