With sewing skills, you should be set to start on a easy to moderate quilt and achieve good results. I sewed for about 50 years before doing my first quilt (my avatar, a queen size) and didn't have many problems (all straight lines, though). I did take a beginning quilting class which helped with rotary cutting and pressing which are new skills if all your experience was garment construction.
There are no quilting police and few rules, just do what works for you. There is one rule I follow:
The 6 foot rule. Before you start your quilt, look at your fabrics from at least 6 feet away to see if any one of your selections jumps out. As you lay your blocks out, look from 6 feet to double check your layout, and lastly, when you're all done, if you don't see any mistakes from 6 feet, you're good! (this last is also the galloping horse rule, if it looks good from a galloping horse...)