modifying vcr to add features and functions

[gmythril]

I am trying to find out ( I don't have any experience electronically ) if there is a method to modifying or rebuilding any brand vcr to add features and functions including upgrading components for better a/v quality and general operational functions of the vcr. Is there a book(s) to start from other than from the basics, cause I need to know if it is practical for someone like me to be able to make an electronics project on vcrs like this. I have used mostly Panasonics, Toshibas and Sonys plus a JVC and Hitachi and have noticed the pluses and minises of each vcr brands and thought if there was a way to modify the vcr(s) to have what I want on the vcr. That is the question I am asking, please be easy on me as I am not an electronics literate tech type. Thank you