Effective communication and negotiation skills may need to play a role in your birth experience if interventions are being suggested (or recommended) by your caregiver(s). If you have a flexible and open caregiver, then offering you options and negotiating your care should be part of their service to you. In some cases, you may be happy to accept everything that is offered to you, without question.
As with all professions, caregivers involved in birth will generally have different approaches to their practise. They will also have varying communication skills themselves. If your caregiver for labour has also done your pregnancy checks, you may get a feel for how they communicate during these visits. If you don't have your own caregiver, then fate may decide whom you get on the day, and how well you relate to each other.
You may have preconceived ideas about what you want (for example pain relief) before you get there. This is OK, but it is important that you realise the benefits and risks of what you are choosing and why. How the 'pros and cons' are presented to you during the labour will often depend on your caregiver's personal opinion. In reality, not everyone is able to present information in a non-biased manner.
For example, if your caregiver is pro-epidural, they may accentuate the benefits of this treatment, and skip over (or play down) any possible side effects. Alternatively, if your caregiver supports natural birth, they may highlight the negative effects of medical pain relief.
This is a very grey area. Sometimes if you are unaware of alternative approaches, then you will need to trust their judgement. In emergency situations you will have little choice, as the professionals looking after you will need to perform many tasks quickly, with little explanation until afterwards.
Fortunately though, there is usually plenty of time to discuss issues, and as with many things in life, there is more than one way to achieve your purpose.