Retaining an expert witness is expensive and may not be necessary in every case. Don’t try to keep up with the Jones & Jones firm: Just because the other side has an expert or because experts have traditionally been used in similar cases doesn’t mean you need one. And if you decide you do need an expert, make sure it’s the best type for your case.
When conducting direct examination, you generally can’t ask leading questions, i.e., ones that suggest a particular answer. Evid C §§764, 767(a)(2). And, of course, you can’t ask objectionable questions. For inexperienced practitioners, it can be hard to craft acceptable and effective questions while in the stressful moment. Practicing your questions in advance will be a great help, as will reviewing both positive and negative examples.