It's difficult with a small kitchen, you can't help but think 'ah lovely new kitchen' and your mind runs away with images of bifold doors opening out into a patio & beautiful garden and to the Aga & dishwasher, huge ff and ....
...and then reality slaps you around your chops!!
you can't make it any bigger, but you can make it function better!!
Are there things about it that are particularly annoying? What are they?
what are the things you like about it?
DIY kitchens are great. Definitely great cost wise. Just make sure you'll have somewhere suitable to put it when it arrives! (The prebuilt cabinets are the best, but bulky!!) and read up on their delivery information.
my current kitchen is small, but on paper you'd think could still fit a lot of stuff in, but the placement of doors, windows, water pipes, water waste & gas meter make it very difficult (& far too expensive to have them moved (£5000 alone for the gas meter due to external complications) so as your trying to do it as economically as possible & by yourselves, it's probably going to be best to work with that kind of thing where it is unless it's really bad!
Houzz has lots of photos & idea & you can filter to small kitchens & various layouts etc. BUT I just found it more frustrating then settling for something because I don't have a bijou kitchen in a gorgeous converted building etc.
so list the things that really annoy you in order of most annoying to least & see what you can do to change them.
& a list of things you love & try not to lose any of them!
DECLUTTER!! It's amazing how little you really use day to day in the kitchen & how keeping things you use twice a year, makes day to day life difficult. If you have a garage/under stairs cupboard or whatever, and have space for a plastic crate. Get one and put 'season/occasion stuff in that if you really want to keep it. But you don't need 20 plates in everyday use, keep your favourites & donate the rest. If you 'Do Dishes Daily' (see Dana K White, youtube) life is not only better, but it'll show you how many plates, cups, glasses you actually use and which are your favourites. Donate the rest. Now before you get your new kitchen. (If you are too worried about doing that, put them in a box & put date on them to donate if not used by x.)