First off, make sure you have strong line, you wll be trying to horse the fish out of the wood for sure, especially if its clear water they love diving into the wood work.
I always prep myself the night before for log jams ( I only fish wood when the water is clear and I've fished the pools thoroughly ). I always pre-tie a bunch of leader line, swivel, hook setups. More time out of the water tying line means less fish.
I'm not sure where you fish, and what the water will be like, as I mentioned before I love log jams in clear water, they produce fish, always. Last week fshing on a Sunday evening on (*#@$(*@!, the fsh were pressured hard all day and people were saying no fish. Worked the wood for an hour and hooked into two fish, lost them both to old line from two years ago, but what to do.
What works well for me is white mesh, salmon roe, under a float, and have a few sizes of roe ready. I drift a few feet away from the jam for a few drifts, then as close as possible to the wood. I've talked with a gentleman once about fishing clear water wood and he told me he hooks the fish lightly and coaxes it out of the jam into safer water... hahaha, good luck with that, thats tough without startling the fish.
Bring a few flies as well, prince nymph, sometimes bead head prince nymph is a killer for me.
Another thing thats worked well for me is if 'm standing up river and floating down into the wood, is letting my float get right up into the wood and then pulling back on an angle and letting t float back into the wood, repeated over and over again, works pretty well for me.
Best advice is remain stealthy, stay low, approach slowly, especally if the surface isn't "roughed up" up by the current and structure.
Happy hunting, keep us updated!