Some tickling tips....
I try to think of tickling almost like I am playing a guitar.
Keep your fingers loose and quick, say the soles, you want to strum the arches, quick and light but with some pressure still.
If you plan on tickling the soles for a while(bondage) you(or ler) should consider using some sort of oil. I have recently discovered the joys of olive oil, but baby oil works too. The oils keep the soles moisturized. If you tickle any skin but esp. feet, they quickly dry out and then they get rough and red and then it becomes painful. But oil keeps this from happening or at least it takes a lot longer. Of course since the feet or any body part can "last" longer, you can add toys, say a hair brush our electric toothbrush.
For armpits you can use the same technique as the feet, light and fast but with pressure.
Ribs and bellies usually require a bit of a firmer touch but not always.
Or course there is always POCKET tickling...
All of these tips are for those that like the lighter tickling
For tourture tickling, ie NJJEN..ahem. Just ignore the oil, keep the toys and when she says she hates you, go for about 20 min longer...

Hehe (Man am I going to get it
🙄 )