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G'day Stefan,
The horsehead isn't particularly easy with an unmodded dslr - the cameras filter cuts out most of the light in the Ha and Hb range.
When I am centering an object I turn the ISO up to 6400 and take 20 - 30 sec subs so I can see the object. In general if the object isn't easy to see in these subs then it isn't going to be a very good image with only 1-2 hours total exposure. I usually image at ISO 800 or 1600.
Try 120s subs at ISO 1600 and use a LP filter if you have one. It may be a bit noisy but it will give more to work with. I doubt whether you will get a great image with an unmodded camera though. My attempts were dismal. You will probably need a lot more than 2 hours.
If you don't use an LP filter it is possible that your camera is picking up more signal from light pollution than it is from the nebulosity so it will be very hard to get a good image.
Tony.
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