would you show some hints few days before you officially tender the letter?
I am now in a situation where I try to avoid from hurting my lead and manager as much as possible, I don't want to appear cruel to them. The reason I want to leave is for my personal growth, it has little to do with the relationship with colleagues, and some more my team lead has been good with me all the while.

I have been telling my other colleagues about this, but not my lead and manager yet. I find it hard to tell this to them. Should I hint them before I officially tender the letter?