Hiya Cringe! 🙂
Wow, yeah, i think what everyone here is saying is totally true. It's tough, not because no one can do it. heck, i've done it.
but it gets dicey. First as others have pointed out, if tickling has any kind of sexual overtones for you -or for her, which she may conceal just to encourage you to 'go for it', then you have an obvious problem.
But it goes deeper than that. The fact is that any touching of a "theoretical" potential sexual partner always begs the question "what's this all about?" especially if there is an actual partner in the picture. the more playful the activity is or the more associated it is in the mind of the public with sexual attraction then the trickier it becomes.
In otherwords you also have to ask yourself, as you begin a new relationship, how likely is it that the girl in question will feel threatened by what you're tickling - even if you say it's totally clean. What will her friends say to her when they see you with your fave 'lee?
Remember, the beginning of any relationship is a time when it's most vulnerable to misunderstandings.
If you really feel okay that the tickling is just friendly play, keep the communication open, keep the boundaries clear, and respect your intended girlfriends feelings about it, even if they don't sound "reasonable" to you. Remember feelings don't follow the rules of reason.
I do hope this helps. I wish you luck, Cringe.
Many blessings,