Thanks for the replies so far.

I wasn't thinking of this being a permanent arrangement, so the question of it looking amateur doesn't bother me (I'm more or less amateur anyway, if you regard being 'professional' as equivalent to 'making a profit' ;-)).

I just don't want to make any mods to the guitar until I've decided whether I want this type of pickup or not, hence the temporary arrangement of the cable trailing out of the soundhole. Maybe I won't need the cable to be taped or anything, but I thought it would be safer and avoid it fouling the strings or getting in the way of playing.

Yes, I have a pickguard so that's a good point Grab/Graham. I can probably use any kind of tape on that without worrying too much.

As for the question of the preamps (raised by Richard B), this pickup has everything in the unit (one thing I like about it), so an ordinary jack socket would be fine AFAICT.

Maybe not "rocket surgery" to you Clinton, but I've never done it before. It looks easy but experience has taught me that things that look easy often aren't ;-)

Anyway, as usual, lots of helpful responses and quickly too - many thanks to you Mudcatters.