You can use http://picmonkey.com to crop your photos to size. Remember to save with sensible name.
Slider 1024 x 400
Square pictures of cottage 300 x 300
3 things – 640 wide (remember front page words go in page extract)
Cottage 640 x 429
Gallery 640 x 429
Use caption rather than alt name (unless want smaller words underneath too)
Top 10 900 x 600
Small 300 x 200 <- now doing 640 x 429 and selecting medium (300 x 201) display
Guest book 150 x 100?
Here’s a list of what you need in order to customise the template
A logo – This should be around 200 x 100 pixels
It can be wider if you like. Fiverr.com is excellent for having logos made.
1 x meet the owners photo 350 x 350 pixels for the sidebar
As many photos as you like fro the galleries page (suggest no bigger than 900 x 600 each)