And if you are really cost conscious, dump the videographer - who watches their wedding video anyway?
If money is really tight, consider what you are providing for your guests (i.e. full sit down meal etc.). If you want a meal, perhaps ask your guests to pay for their meal and skip giving you gifts. Where there is a will there is a way.
For a real budget wedding, you maybe have to decide if you can cut that guest list further - there are people who were at our wedding that I have hardly seen since - perhaps I could've culled some of them
If you are lucky (as we were), you may have some one (a relative other than your mum), who is willing (in lieu of a wedding gift) to buy or put money towards the bigger items - my wife's brother paid for her dress, which in our case was about 2000 AUD I didn't have to come up with.
I also agree with those above - don't go into debt if you can help it.
I have also quite recently been to a church wedding where the bride and groom had "afternoon tea" at the church with the guests rather than a full blown reception - they were both students and couldn't afford anything else - and a bunch of people from the church did the "catering". This way they could invite everyone they wanted without blowing their tiny budget.