You have to get into a completely different mindset and not just be aghast at the price of everything, especially things which will be used every day or long term, like floors and sofas. You need to acclimate yourself to a whole new world of price tags.
I have to say hate laminate with a passion. I hate that plastic is working its way into every single aspect of our lives. A good quality laminate will not cost much less than engineered wood floors, but it will sit in a landfill polluting the environment for an eternity. The cheap stuff does not stand up to wear and tear - just look at display models which have been up for a while.
There are things we could have gone cheap on but I am glad that I didn't - e.g. led-lit bathroom mirror, vertical radiator in the kitchen, made to measure roman blind for the living room. None of these things we will take when we move, but they improve my quality of life whilst I'm here. Don't underestimate how much small, daily things will affect you.
Then there are things we went cheap on and regretted e.g. extractor fan which dropped its ball bearing after a couple of months and doesn't seem to actually extract much steam. The sink unit which was a good price but annoys me because I have to bend down to get things out rather than just pulling out a drawer. I curse myself most days for not spending an extra £200 on a drawer unit like I wanted.
You also have to consider full cost of something, so tiles may only be £10/sqm but what about the underlay, grout, etc? What is the final cost of your options with all those things taken into consideration, and is the difference significant enough to make a difference to your life?
If the kitchen is real wood, I would strongly encourage you to upcycle it, paint the units, replace the tiles and update the countertop. If the cabinets are in good condition then save those too and maybe just replace the cabinet doors.
Finally, my best tip is to wait for sales. Things will always be on sale and you can get decent quality stuff if you just wait a bit. Our bathroom tiles were 50% off in a flash sale, down from £40/sqm. We also got 15% off our engineered wood floors.