Cinema Tools. It literally takes one second, as opposed to individually clicking every clip in a timeline, typing in the percentage, unchecking frame blending, then rendering.
Also, conforming is better to use as a simple precaution. Sometimes FCP hiccups and can't render the timeline, saying "out of memory." This is often due to the fact that digital frame rates are not perfect numbers (integers), which is why 24p is actually 23.98, 30p is actually 29.97, and 60p is actually 59.97. Sometimes when working with long continuous clips and long renders at once, these numbers don't completely "add up" (I'm using this term loosely) and the frame rate of the file becomes inconsistent. This is fixed by finding the clips that have errors, and conforming the source files to the frame rate of the timeline (this even happens to 24p footage and needs to be conformed to 23.98). This entire mess can be avoided in the first place by making frame rate conforming a standard protocol. While I only conform footage shot in 30p and 60p, sometimes 24p footage needs to have it done in order to fix the problem.