swatting flies with a sledge hammer [closed]

Is the phrase "swatting flies with a sledge hammer" a proper way to say that something is a litle bit too complicated?

No, because what it means is to use disproportionate force or expense to overcome a minor problem.

its a bit complicated should suffice.

No.

Swatting flies with a sledge hammer would be an example of overkill:

1 : a destructive capacity greatly exceeding that required for a given target
2 : an excess of something (such as a quantity or an action) beyond what is required or suitable for a particular purpose
// publicity overkill
// an overkill in weaponry

The following might be an example of something too complicated:

I swatted a fly with a 6-foot-long Meccano set construction I'd built with two plungers, five rubber bands, a car battery, and an alarm clock.

While, yes, this might also be considered overkill, the hammer solution is very simplistic—while this is very complicated.