We are doing this currently, my mortgage application will go in in early December.
Initially we went through our bank statement with a fine tooth comb and cancelled everything we don't absolutely need, except our family Spotify subscription. We have small accounts attached to our main one where a monthly amount goes for fuel, groceries, pets, holidays etc. The day before pay day I transfer any excess into savings. All holiday savings now go straight to house deposit savings.
We also paid off everything we owe. So the £210 a month that went on car finance now goes straight to savings, I earn around £200 a month extra as my student loan has been paid off so that goes straight in and so on. Having zero debt was also a condition of my mortgage offer so better to do it sooner rather than later.
We've cut our grocery budget by 25%. We're terrible food snobs so this has been an easy saving.
We sold everything we don't need. We don't go out often at all now (but do still treat ourselves to a drink out occasionally so we don't lose heart) I have become an overtime fiend and DH has picked up the slack in the house while I'm out.
Truthfully it's not much fun and I'm unsure how sustainable it would be in the long term. I'm glad we have an end point in sight, but seeing the pot grow is somewhat addictive 