The guy is amazing! I'm not saying I'm an expert or better than this guy but let me share some tips/precaution for those who wanted to DIY. There are some parts that are not necessary or should I say not suppose to dismantle to replace the shutter blades.
* Not suppose to dismantle lens mount- the distance of lens mount to sensor is critical
* Not suppose to dismantle the AF sensor- the location of AF sensor is very precise. A fraction of a millimeter means a lot
* Not necessary to remove battery compartment
* Must keep the sensor properly to prevent dust/dirt on the surface of the AA filter
That is the difference between someone who really knows how to do it and someone who has the guts to do it...