CRISPR guide RNA design and primer synthesis
A quick check with BLAST returned the following result:

Homo sapiens huntingtin (HTT), mRNA
Sequence ID: NM_002111.7Length: 13669Number of Matches: 1
Related Information
Gene-associated gene details
GEO Profiles-microarray expression data
PubChem BioAssay-bioactivity screening
Range 1: 267 to 286GenBankGraphicsNext MatchPrevious Match
Alignment statistics for match #1

Score           Expect  Identities  Gaps        Strand
40.1 bits(20)   0.017   20/20(100%) 0/20(0%)    Plus/Minus
Query  1    GGAGGCCTCGGGCCGACTCG  20
            ||||||||||||||||||||
Sbjct  286  GGAGGCCTCGGGCCGACTCG  267


The sequence you have is 5'-3' and it matches the Minus strand on the Human genome. You don't need to reverse the sequence!