During F2L when only the last pair remains, the two pieces are beside together and over the empty slot like on these two examples. The optimal way to insert them I guess is learning algorithms from the wiki for the 5 unpaired cases. But I´m not at the state where it would benefit me that much so I would like a more intuitive way that can be used for all cases. Today I would probably do a Y' U separate the pieces, pair them up and insert. That is hardly a good way since it sometimes require two cube rotations.
Two other ways I could think of is:
1. d R' U R
2. R U2 R'
... and then pair up and insert. Is there another way to do it? Any recommendations/tips for how I should do the pairing?