I think damsels are more difficult than clowns. There is a small section about damsels in the Complete Illustrated Breeder's Guide to Marine Aquarium Fishes by Matthew L Wittenrich, and the book is great, so I recommend that you buy/borrow that to read through. he doesnt mention much or anything about Dascyllus melanurus (assuming thats what you mean by four stripe damsel) but here's a few notes about other damsels that are in the book:
Dascyllus eggs require about 3 days to hatch, and larvae meaure about 2 mm upon hatching. The yolk is completely depleted so feeding needs to begin the morning after the hatch. You will need to add greenwater to keep the larvae away from the rearing tank sides. First feeding is the bottleneck, and it seems that rotifers, although often accepted by many species, are inadequate and mortalities are very high--typically around day 8. However, the successful reports of rearing for Chrysiptera species stated that rotifers and artemia were used. If I were you, I would look into getting some S strain and L strain rotifers to have on hand. You may also need to look into culturing other foods and there's a sticky thread on the top of the forum that goes into how to do so. Good luck!