Looking directly into the sun can be dangerous to your eyes, so wear dark glasses and don't look right into the sun. If you use a camera be sure you don't look at the sun through the lens. Staring into bright light for any length of time can be extremely uncomfortable and cause spots before the eyes, so if you are keen on capturing this effect then keep your gaze away from the brightest part of the sunlight, making sure you are fully protected with sunglasses.
This scene is detail from one of the paintings in my forthcoming book Skies, Light & Atmosphere, and you can see how the strong direct sunlight has bleached out the ends and parts of branches, while at the same time turning them to red and gold. It also has the effect of weakening the strength of tone in the affected parts. Most of this effect was achieved with a fine sable brush - a number 2 or 3. Try out the effect of changing colour and strength of tone on scrap paper, and with a little practice you'll find it won't be too difficult a technique to master. Ease the pressure off the brush as you describe the branch, moving outwards from the trunk.
Skies, Light & Atmosphere covers a wide range of landscape subjects and will be available in early June. There is an associated DVD of the same name, available exclusively from our website or at my demonstrations and courses. Watch out for our special offer on the book and DVD