How to self settle and get rid of dummy?

My baby is 6 months and depends on dummy for sleep, it’s really tiring, as she doesn’t nap during the day, she doesn’t have a dummy during the day time and for her day naps as I’m slowly weaning her off the dummy. However, when she does nap and I put her down she instantly wakes up! However can nap on me for hours! How do I get her to self soothe? She’s constantly wanting something to suck to get her back to sleep? Anyone in the same boat and what did you do to help??