Let the boat do the work
Under nomimnal conditions, hoist the rode tight then sit back, relax and let the action of the seas on the boat work your anchor free. As far as whats good enough, for day sailing anything will do a small "lunch hook" with minimal chain and scope will be just fine. To prepare for extended cruising and storms you should have graduated approach with diffrent tackle for diffrent situations. Every year I budget for new ground tackle, so it adds up over time, and I can plan for diffrent situations. I live in Biloxi and for Katrina, I had 6 anchors and tied to 3 trees. The anchors ranged from a 60# CQR to a 30# Danforth. Each anchor had 50-200 ft of 1/2 to 3/4 chain and 300 to 600 ft of 3/8 to 3/4 line. As I bought my ground tackle over the years the guys at the marine store scoffed at me telling me 100 ft shrimp boats didn't use what I was merely buying at that time. The result was... in a hole 15 miles North of the coast there was a 35 foot surge and 200mph winds of 18 boats in sight of mine 3 of us were floating. By the way thousands of pounds of ground tackle may seem impractical for a 28 foot boat, but if you buy it in stages and collect it each year some day it will save your butt. Just leave what you don't need in storage so you can have it when you need it.