This is a summary of an article on catching Walleye. It is not specific to Greers Ferry Lake, but almost all the tips would apply on any lake.
There are two challenges in catching Walleye or any other species of fish. Finding walleye and getting them to bite.
The linked article gives these 7 tips:
a. Use a lake map to find walleye
b. Use a fish finder to locate walleye
c. Look for spawning bait fish
d. Take advantage of the evening bite.
e. Use finesse techniques when fish are not biting.
f. Choose the right bait.
g. Use the right presentation.
For full details, check out the article.