We coulkd meet up...and bring a number of books we could lend out. Then all agree to meet again after 2-3 weeks to return what we borrowed and get what we lent out.

Surely we could exchange contact numbers in case we want to return it before scheduled meet-up or if the person who borrowed the book didn't return it on time.

Like me who have all 7 Harry Potter books, and lost the 6 because someone forgot to return it, I too would be hesitant to lend any books that I have.