The expression "Bob's your uncle"
always implies simplicity of execution and success or satisfaction with the result. Practice the KISS principle (Keep It Simple) so you can soon say-
"Bob's Your Uncle".
The following links give lengthy explanations. Apparently, thieves and pickpockets were
once called "bobs". The reference does not say but I think London policeman are now called
"bobbies" because they used to catch "bobs".