just to chip in my 2 cents worth - any expense incurred by you in earning your income is claimable on the production of receipts. You may claim up to $300 total without receipts.
Anything that contains the word 'moisturising' or 'rehydrating' is claimable for all you chaps into personal grooming.
The biggy for most GA operators is if you fly for example from DRW to GOV or some other remote community you can claim 1 day at the special Zone A rate, irrespective of whether you have overnighted there or not. There is a table accessible on the 'net that you can check the locations as to whether they are allowable.
As with anything legal - it's all about interpretation. Even though when you read the ruling on the special zone allowance it may be read and understood as one thing, there is another perfectly acceptable understanding which allows the claim. Some accountants may argue in the negative - if so, time to change - it is a perfectly legal and claimable deduction.
Telephones - any call made in the course of your employment is claimable, and in some cases the costs incurred in maintaining the phone if you are required to be on call are claimable.
Driving - it's not the time spent, but the total mileage: calculated at x cents/distance depending upon the motor cc of the vehicle. Mileage is claimable on the production of a diary or a vehicle log book.
It may be worth the cost (which does vary depending upon the complexity of preparation of your return) to visit a tax agent/accountant.