What I did when I was going to buy house.
Estimate bills, mortgage, council tax, insurance, food etc etc
take total of above and subtract current equivalent outgoings (eg rent to parents) and bank the diff each month. That for me sorted my deposit over a year

This in theory put me in the same position as if I was already living there. I found it ok so I knew I would be ok whe i got my own place.
For estimating bills etc find someone who lives similar to how you will and get some estimates off them.
Once I had my house I used to budget my utilities etc based on the year and had a book where each month I put my £30 gas etc, when I payed a bill I knocked it off my running balance, obviously if it went negative I had to pay in extra that month, as time went on I increased or decreased the amount per month as I needed, I also "capped" each one at the maximum possible bill I could get so that I knew I would be covered for worst case, but if I hit the cap I would treat that as extra spending money till it dropped below the cap.
Working this way I had all my bills covered and I had actual cash in the bank to pay the bills. Did this after pay day each month and then basically compared the amount my book said I needed to my bank account, diff was spendable cash.
Worked well for me, may not for you, just work out a way that you can and will do the budgeting and stick to it.
Some people pay say £100 or £50 a month into an emergency bank account, thats supposed to take the pain out of something like the washing machine going **** up.
I stopped budgetting food and jst controlled that one on the fly, if I was spending a lot that month I would conciously cut back a bit, if I was doing ok I would just buy what I fancied.
The closer you on income to fixed expenditure the more you need to watch.
At one point I stopped taking my cards to work and only took some cash, that stopped me going and impulse buying at lunchtime as I had a terrible habit of buying CDs that I really didn't need.