Is editing and renaming a file an effective way to wipe its original data from your drive?

Also, with some SSDs, some OSes will also TRIM on delete and run scheduled TRIM afterward. For example, Windows will TRIM an internal SSD “immediately” (but asynchronously) and then weekly, making recovery that depends on the SSD firmware unlikely. If an adversary doesn’t have tools that can access the drive’s contents without the firmware, it’s probably not something to worry about after some minutes/a week (with some SSDs and some OSes). As other comments mentioned, whole-disk encryption would also work with fewer ifs.