- Decide your max before looking at houses and don't increase it because the house is especially nice.
- Offer under the asking price. Especially now in the current market, but do so anyhow. What have you got to loose?
- Don't be scared by there being another offer in. There are lots of houses to go around and the chances 50/50 on most offers actually existing.
- Stay in control. It is you who has the money, so you call the shots.
Also remember - I have never bought a house before (or this one yet) so this is only my thoughts after my vast experience - decide for yourself.
Once your offer is accepted you have a few days to sort out getting your booking deposit to the estate agent. If you have already sorted out a solicitor you may want to do this through them.
At his point you should let your Bank or mortgage adviser know.