The best and most complete info about sensor cleaning is here:
http://cleaningdigitalcameras.com/
Read all of it thoroghly and see if it's something you are willing to do.
The guys who maintain this website also sell the supplies and tools, including everything for the so-called "copperhill" method. They are repair techs themselves, so are experienced at the cleanings and give reasonably objective views about the various methods. They might have their own preferences, but aren't trying to sell you one particular method that they sell, because they pretty much offer supplies and tools for all the different cleaning methods. Their store www.micro-tools.com
is one of the top suppliers to the profesional camera repair industry. (Actually, it's "stores" - plural - they have facilities in Europe and in N. America.)
Essentially, there are sifferent degrees of cleaning, depending upon what's needed...
1. A puff of air (Rocket blower)
2. A gentle brush
3. Vacuuming (gently)
4. Slightly adhesive particle pickup
5. Individual speck removal (Speck Grabber)
6. Wet cleaning
7. Final polishing (Sensor Pen, often necessary after a wet cleaning)
Often cleaning is done in this or a similar order, though one or two steps might be skipped (brush, vacuum, or adhesive, for example), then stopping at whatever step has solved the problem.
Tools that make the job easier include a loupe or other magnifier and some sort of light, to better see the sensor (actually the AA filter that sits in front of the sensor) down inside the camera.
You have to be certain to have enough charge in the camera's batteries to maintain the mirror up and the shutter open for the period of time while doing the cleaning. At tops, a freshly charged battery in some cameras might only give 20 minutes or half an hour holding those open, so you also have to work efficiently too. You also have to be careful not to accidentally turn off the camera while doing the cleaning. If the shutter closes or the mirror drops done onto a cleaning tool, some damage might be done that would require an expensive repair.
The other big consideration is to not use too much cleaning fluid. You don't want to flood the surface and risk fluid seeping around and behind the AA filter or dripping elswhere inside the camera.
You would be wise to learn how to clean the sensor yourself and to have at least basic supplies for the purpose, should you need to do it in an emergency while on location somewhere. But you also might find a local shop that will do it for reasonable price, and let them take the risk most of the time.