I use old school hand saws for most everything but ripping sheet goods. In my case, it’s mostly because safety triggers on power tools aggravates the tendinitis in my elbow. But certainly reduces the danger of cutting fingers/hands! I have a nice old Stanley mitrebox I bought from an auction; a $5 plastic one from Lowes works just fine, though.
I agree that you could get by just fine by having the store cut 4 × 4s for the posts & 2 × 4 for the feet. I see a lot of schooling jump standards made of just that. Then all you’d have to do is drill holes for the hardware.
I’m a woman who taught herself carpentry after getting fed up with men trying to rip me off to build things for the farm. Always had trouble with it in the past & thought I must be bad at it. Nope! It’s just a skill like any other & I’d just never been taught the basic how-tos. I bought a book with concise explanations & fun-looking projects at Tractor Supply, of all places, and filled in the gaps with YouTube videos. Turns out I have reasonably good natural aptitude for it!
Eta: If you haven’t checked out the price of lumber lately, might want to sit down before doing so. Lol. Some recent transplant to town posted on our FB community board asking for companies to remove a 3 board fence from his property. He genuinely seemed to not grasp why 15 people were clamoring to come remove it for free. I tried to explain the insane value of his fence because there were unscrupulous contractors circling like sharks smelling big $$ instead of blood. He still didn’t seem to get it – seemed to think I was suggesting removal would be expensive because the fence was expensive. Sigh.