Thanks for your help BB. We love living at this location. It is in West Pennant Hills in Sydney if you know the area. It backs onto bush so there are lots of trees/leaves/sticks to deal with which makes the lawn a bit more challenging.

Most of the yard would get a fair bit of sun for most of the day. The Sun goes behind the trees behind the house about 2-3pm, but it would get some sun from fairly early (7-8am). There are some parts of the lawn that have localised shade. The area in the last photo suffers the most in this regard. It is the lowest part of the lawn, and has poor drainage so is often quite wet and has some moss also, but the grass is poorest in this area.

A couple of months ago I got one of those hand lawn coring tools from bunnings and used that. I thought that was all that is required, but I just googled this scarification process and it seems what I need to do. From what you say it may be too late to do this so I should wait until next spring? What would be the effect of doing this mid summer? I am the DIY type of person and would prefer to hire a machine and do it myself to save $$$ and learn a bit more in the process (and avoid taking out sprinkler system). Is there any threads on this forum with the details on doing this to save repeating it here?

I do agree about the scarification of my own body... mid 40s and things have taken a turn since 40!!

So moving forward with the mowing assuming no scarification to be done in the short term, Is there any recommendations on how to set the height on the SB45 and how to adjust it over time (Do I slowly bring it down or just set it at a height and scalp it in one hit). I understand the height adjustment on the front roller, but I am not sure how to measure the height or estimate from the position in the arc the adjuster moves through (half/quarter etc.). It is hot in Sydney today, but a cool change and a few cooler days from this evening, so I am thinking it is a good time to mow again and possible reduce the height.

Cheers,

Adrian