Wind resource inputs - autocorrection factor and diurnal factor I found difficult to interpret.  If example of values and the effect upon an average resource profile were given then it may assist me to make a decision

The Help system does have some explanation of those terms.  If you look up 'autocorrelation factor' in the index you'll see a description of the term, a link to the article on autocorrelation itself, a histogram of the autocorrelation factors measured in 239 US cities, along with a link to a table showing the actual values measured in each city.  If you look up 'diurnal pattern strength' you will see similar information for that parameter.

As a general rules of thumb, the lower the autocorrelation factor the higher the value of wind power.  The autocorrelation factor is the 'feast and famine' index: a high autocorrelation factor means you tend to get a long period of high wind, then a long lull.  That is to say, you get a long surge of wind power, some of which you might have to dump as excess in an isolated system, then no wind power at all for days at a time.  A lower autocorrelation factor means the wind power tends to come in smaller, more manageable pieces, and the lulls tend to be shorter-lived.

The diurnal pattern strength simply indicates how strongly the wind speed depends on the time of day.  If the wind speed tends to peak at the same time as the load, then a strong daily pattern would be a good thing.  It would mean the wind blows when you need the power.  If the wind speed peak was out of sync with the load peak, then a strong daily pattern would be a negative.

Please note that if you have measured wind data, when you import those data into HOMER it will calculate and display all the wind data parameters.