sprint to oly advice

I completed a sprint last week in 1:42:42, respectful not great (my 5th time over years on the same course). Essentially trained since January. Looking for a new challange. I'm considering doing an Olympic Distance in 8 weeks. Can't seem to make the mental leap to those distances. Especially the swim, which once I get past the start actually to pretty well in - approx 15 min 1/2 mile. Anyone experience the same trepidation in moving up? I truely marvel at those who start at this distance!!All words of wisdom greatly appreciated. thnx, Mark