What kind of shot are you coming from?
What kind of shot are you going to?
Are all of your clips from the same angle?
Do you have cutaways to go to during the transition
from Clip A to Clip B?
Are you trying to match-frame from Clip A to Clip B?
Is there sound involved or just video?
What is your subject(s)?
Without more information it’s hard to offer suggestions.
Offhand, it sounds like you are trying to match-frame
between two nearly identical clips, which is a challenge
whether you’re editing tape-to-tape or non-linear.
If this is the case, then 94% of the work for the desired effect
should have been done when setting up your shots in the field, in order to facilitate easier match-frame editing later. If this is, indeed, what you are trying to accomplish, then be aware that neither Final Cut nor any other NLE application offer magic solutions to match-frame editing. The “magic” is applied in the field, not the edit suite.