When we went on our debt reduction trip the most effective thing was to reduce the spend triggers.
I spent time learning how to cook - we love good food and used to spend a fortune on "foodie" food. Most of which is really easy to cook but costs a fortune. It also means that when you go to the supermarket you can take advantage of the yellow sticker section - eg I have 500g of Fennel (total cost 52p) that is going to be roasted with chilli and lemon and coupled with pasta for tonight's dinner. Total for 4 including the salad is no more than £2-3.
We shopped once a month in Aldi, cooking everything from scratch - I bought the same basics every month. For top up shops I would cost everything I needed and then take just enough cash to buy the list. That way I couldn't be tempted by random things throwing themselves into the trolley. Frozen vege and fruit are your friends here.
To make the food interesting I spent up on spices and sauces from the international supermarkets - Indian, Chinese and Persian. I would spend a day making up spice mixes so we weren't tempted to order take aways. While I was there I would stock up on noodles, rice, grains and pulses. One investment I did make was a £10 coffee grinder - to grind the spices.
I took to growing my own herbs and lettuces - expensive to buy but easy to grow. Lonely very kindly shared her seed collection when we were in a really hard space. She saved us from scurvy.
We got rid of one car - keeping the most fuel efficient one.
I got rid of my mobile phone - I had a work one people could ring me on if it was urgent. I love not being at everyone's beck & call so I have never got around to getting another one.
We stopped giving the kids pocket money (5 and 8 at the time) and introduced the concept of a family budget - they are sighted on all the bills & if they want something it gets given the same consideration as mine and dh discretionary spend. They could see the choices that had to be made and it stopped the nagging in the shop.
Re configured our social life - instead of meeting friends at the pub we just have an open house. Our friends drop in or we invite people over. It helps that we live in an area that people come to visit - if we lived in the suburbs of a minor city it may not be a successful model.
I found that if we replaced things with a different joy it was easier to keep the savings going. If you constantly feel you are depriving yourself then it becomes a grind. If you change your mindset to the swap is an improvement it is easier - going to the pub to be talked at by the village bar fly or having friends over for a super relaxed dinner?