I'm looking at the cheapest way to safely power-saw some lengths of timber to build shelf units. I could use a hand saw but I'm hoping to avoid the effort and risk of straining my arm. It's a one-off project at this stage, actually it would make more sense to hire a saw or pay for cutting, but I don't know if that's possible? So that's the first question, I guess.
In terms of safety, I'm assuming a circular saw is a risky option without extra equipment and experience. I do have a small DIY workbench I can screw or clamp a miter saw to for reasonably safe use.
So, if this is a good hobby choice: https://www.bunnings.com.au/ozito-1600w-210mm-8-corded-compound-mitre-saw_p0025645

My question is (since it's not in the product details online): what width of timber can it handle? I assume one can cut half way through a wider piece and then flip it over to cut the other half?