I agree with Ard, stay out of the water, I try too use the bushes and tall grass as much as I can too hide me most of your fishing will be on your knees, and back from the edge.
Cast as little as possable (wait untill the line is strait down stream no false cast just flick it too where you want it too go) some people dont like this style of fishing its more stealth and paicience.
I have found for me wets and nymphs work best but the waters I fish get a lot of angling presure (so the fish wont rise normaly). on one of them I also use streamers (day and night)
One thing that helped me heaps was, pulling some of the weed out and putting it on a tray, shake it a bit and look on the tray (there will be some bugs) and sort through the weed you should find some cased caddis nymphs, with the caddis nymphs break each type open and take note the size and colour try the flies that are similar throught the year take note when they work.
The bugs that fall out of the weed before and after you look for the caddis will also be useful to you, if you can identify them take note if not with a small plastic jar take one of each keep them seprate some are likely too eat the others
(esp damsel fly and dragon fly nymphs some may flys too) there will be midge, mayfly and damsel fly nymphs and maybe more.
there will also be some in the gravel and under stones worth looking at (they are harder too get).
If you tie your own try and immitate what you find if not, you can find patterns that will do.