5. Are there any free video tutorials showing how to install window and door parts?

Applying Window Weatherstripping and Seals ( Video Tutorials )
 
To determine how much weatherstripping you will need, add the perimeters of all windows and/or doors to be weather-stripped. We suggest you add 5% - 10% for miscuts and waste. Also consider that weatherstripping comes in varying depths, widths and lengths. Weather-stripping supplies and techniques range from simple to the very technical, so you might consider calling someone who does local window and door inspections and surveys, or do your homework and read the instructions and project outlines on the weather stripping package.

One of the best online window and door sources is to visit the YouTube Channel Link: http://tinyurl.com/mo2fbjf