How to lighten hair Natrually? Tea bag remedy or Lemon juice?

Hi =)

Which would you recommend and how do I do it? Can you provide a link for instructions to follow?
What is your tried and tested results, would you recommend it?
And how often shoul I do it?

What is the worst that can go wrong? Worth taking the chance?

I no longer wish to dye my hair chemically so I’m going the natural way.

Thanks .=)