The best way to have an expensive divorce is to not talk to each other and then argue every point from who gets the toaster or the Waterford crystal to the level and duration of maintenance payments.
Make a voluntary agreement between you
The more you can agree the more chance of having an affordable divorce. Unless things are really simple and can be easily agreed you are probably going to need a solicitor. However, the less time he or she spends on your case the less it's going to cost you. Solicitors charge by the hour and some charge like a rhinoceros at full speed!
If you can talk things through calmly, rationally and make a voluntary agreement, you'll be saving yourselves a lot of time and money. Fighting it out in court is very stressful, very expensive and can take a long time. The more strife between you the more difficult it will be for your children and for you to create your new and better life after divorce.
The court will need to make sure it's fair
The court will have to decide whether the legally binding agreement between you is fair. How does it do that? Well, it takes various matters into account such as the earning capacity, property and other financial resources which each of you has, or is likely to have, in the foreseeable future, including any potential increases in the earning capacity of either of you.
Specifically the court will consider the following:
1. The welfare of any children of the family under the age of 18
2. The financial needs, obligations and responsibilities which each of you has or is likely to have in the foreseeable future
3. The standard of living enjoyed by your family before the breakdown of the marriage
4. The ages of both you and your spouse and the duration of the marriage
5. Any physical or mental disability suffered by either of you
6. The contributions which each of you have made, or are likely to make in the foreseeable future, to the welfare of the family - including any contribution by looking after the home or caring for the family
7. Where relevant, yours and your spouse's behaviour
8. The value to each of you of any benefit which one of you will lose the chance of acquiring because of the divorce(most usually pension provisions).
If you can bear these fairness criteria in mind when making your agreement then the court are far more likely to approve it and do so quickly. Arguing about kitchen appliances or wine glasses is never going to be a good use of your time.