Andre. All these sorts of kits have the same level of difficulty, be they 1/700 or 1/350 scale ( the galleons are a bit moire tricky!!).
However with a bit of care it is possible to produce a good result. Go slowly, dry fit the bits to ensure a good fit before painting or glueing..
A modern carrier such as the illustrious will be possibly LESS tricky that a smaller battleship or something, less very small fiddly bits. And in any event, a larger model always looks better than a little `un (generally speaking).
I have just done an illustrious, albeit a tichy bit bigger…
Ashley