My best advice would be to think about weddings you have been to and think about what you remember about them.
I would wager it was things like whether the food was decent rather than whether there were chair covers. Can you remember the favours at any? Did you use any or are they just accumulated stuff? Did you even see what the bride had on her feet? Could you tell whether her pearl earrings were genuine?
Then think about what lasts beyond the day, basically the photos, the rings, and the vows.
Spend your money on those two categories, things that will last and things that people will remember. Don't bother with the rest or do it cheaply.
So we did our own invitations, seating plan, order of service, place cards etc it cost the price of some coloured card.
Me and my bridesmaids did our own hair and make-up. We helped each other and my mum did my hair. None of us have any qualifications or special skills.
We had no chair covers, special table linen or decorations beyond a flower arrangement per table.
The button holes were roses bought at the supermarket the night before.
We didn't have wedding cars. We drove ourselves there and I got changed at the venue.
We served sparking wine rather than champagne (most people can't tell the difference and many prefer cava/prosecco to champagne anyway) we preferred to be able to serve our guests more drinks.
We made sure the food and the photographer were good (although not the most expensive options). I didn't scrimp on my dress, because it was important to me, the bonus was that the wonderful corsetry meant I didn't need expensive underwear just a pair of M&S knickers!
My shoes were hand me downs or vintage depending upon your view but free.
We did rent decent suits for the men but this was cheaper than buying and neither groom nor best man had anything suitable.
We used recorded classical music apart from during the signing of the register when a friend performed as a gift.
The cake was made as a gift by my sister (it was huge and tasted great, we still have some left 10 years later!).
Oh and we haggled the price of our gorgeous venue and had a sunday rather than a Saturday which made somethings cheaper.