Honestly, retail investors really don’t need to learn the whole “block builder, bundle” package to the point where they can write scripts. You only need to know two things: first, the transaction you broadcast doesn’t necessarily go directly into a block; in the middle, it may be “bundled into one lump” and sent along with other people’s at the same time; second, the ordering of this lump can be designed by someone, so slippage, getting sandwiched, and transactions that look like they succeeded but end up being executed in a really weird way… many times it’s not because you’re clumsy.

I personally trace routing down to each hop, but that’s a professional ailment. A more practical focus for ordinary people is actually: don’t force it through under extreme slippage, use reasonably reliable private/protected transaction entry points as much as possible (which can reduce the chance of being targeted—not a magic bullet), and don’t blindly chase hot topics around chain upgrades/hard forks/when there’s scheduled downtime maintenance—recently everyone’s been speculating again about whether there will be a migration. The busier the mempool gets, it’s as chaotic as a street market; bundles are even more likely to “pick up” urgent orders like yours on the side. I also can’t say which day things will be calmer—anyway, being cautious never hurts.