There are many people with dwarfism who learn to drive successfully, requiring a variety of different adaptions, some more simple than others.
Pedal extensions are a common adaption used for people with dwarfism to allow them to drive, these can be purchased from a number of different places:
There are a number of other different adaptions which may be useful, including hand controls, extended stalks (indicators and wipers), extended/electronic handbrake to name a few. It may also be useful to consider automatic cars for ease.
Depending on your adaptions, you may be able to learn to drive in a regular driving instructors car, or one with extended pedals. It may be possible to find this with the British School of Motoring.
However, on many occasions it is necessary to use your own car with personalised adaptions. If you are in receipt of higher level DLA, you may be able to access Motability, leasing a car through their scheme.
The first step would be to apply for a provisional driving license, indicating on the application form the necessary type of dwarfism. You will then be contacted to provide medical evidence from your doctor, to support you ability to drive and the form of dwarfism you have indicated on the initial application.
If you are in receipt of DLA, once you have your provisional license, the next step would be to contact Motability who will advise an assessment to determine the adaptions needed, these are often organised through Motability and The Forum of Mobility Centres.
If you are not in receipt of Motability you can contact The Forum of Mobility Centres yourself, alternatively you can contact Regional Driving Assessment Centre, both to arrange your own assessment, at a cost.
They will then arrange for you to undertake an assessment with an Occupational Therapist to determine the correct adaptions to suit your specific needs and facilitate your driving. Advising on the car specifications which would be suitable, along with the adaptions which would allow you to drive.
In terms of a driving instructor, it is possible to have a regular driving instructor, from your local area, who isn't specialised in disabled driving etc. however they may need to be accommodating in terms of allowing you to do things slightly different to standard. However, if you do require a specialised disabled driving instructor, there is some information from the Disability Driving Instructors website and if you are on Facebook, there is some information on this page.