Like risk assessment, this is something that we all do during the day as we work, it is as simple as wondering why the children aren't interested in the playdough this time when usually they really enjoy it - is it old and hard? Are they fed-up of the same old tools to use with it? Are they uncomfortable using it at an adult sized table? Then we try something new - make a new batch, put out a tub of pebbles to use with it, or set it out on a tray on the floor for a change. Then we observe to see the effect, and we have learned something! Self reflective practice is just this, but writing it down can be important. it can help to focus our mind on exactly what needs to be done, and is also paper evidence that we are striving to provide the best standard of care that we can. It will help to complete the SEF (Self Evaluation Form) when you come to do it.
This link from the NCMA is a really useful booklet to work through to start you off with reflective practice.
Another way to go about it is by auditing each area of your provision systematically. Our childminding group (called Little Foxes!) has begun this process and we have decided to work through each of the 16 sections of the EYFS. We are beginning with section 1.2 of 'A Unique Child', looking at Inclsuive Practice. After looking at all areas carefully, write an action plan detailing what changes you want to make, how you will make them, by when and then sign and date them when completed.
Whichever option you use, or a combination of both, I would recommend attaching copies of evidence to the sheets you write on; evidence could be a list of policies you have, a photocopy of an observation made, a copy of a planning sheet, photographs of an event, e-mails between you and other organisations, copies of training certificates, articles/information you have read that have informed your practice, questionnaires from parents.... there are many many examples!