No, I Was Not Also Standing On My Head

From Cryptogram Corner:

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* KP MA POBH OW GXHHJAB AG WZHHIF BAXH ZXHIOAVW PFKM TFHM K BKM FOPW * 
*                                                                    *
* FOW PFVBN TOPF K FKBBHX.                                           * 
*                                                                    *
* BKXWFKCC CVBWJHM                                                   * 
*                                                                    *
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"At no time is freedom of speech more precious than when a man hits his thumb with a hammer" - Marshall Lumsden 

This particular puzzle was more difficult than most cryptograms. I finally focused on the three words FOPW FOW and TOPF. I figured it out by looking at a list of common three letter words where I could slide a different letter into the third spot creating a new four letter word where I could then take the first three letters of that word rearranged would be the last three letters of a different four letter word, where none of the letters could be 'a'. Tah Dah! 

FOW -> FOPW -> TOPF
his -> hits -> _ith 

I carefuLLy eXamined about 40 three letter words, sliding different letters into position three (P of FOPW) before finding 'his'. I was pretty sure that an 'a' needed to be used twice in the puzzle as a stand alone word for K. 

After that, it was easy.