Hi Clema,
When you say sight nymphing, you mean actully spotting the fish in clear / shallow water and then watching for the take? I do that quite a bit on some Catskill streams, but I find that technique is greatly limited to the conditions at hand. For every couple spots where possible, there are a ton more that you can fish indi or euro. It is great when it works, but in my experience, you'll be walking over a lot of fishable water if looking for areas to sight nymph.