Having to have a $500 to $2000 laptop powered up and online at all times to serve ad-hoc wifi is a poor solution in the world of $20-$30 N routers and access points. I prefer wired anyways, esp considering the Amiga doesn't support up to date wireless protocols legacy side. I'm not running my AP's with WEP or basic WAP, not for any amount of money.
But yes, it's doable without much effort. A matter of a few clicks, in fact. But I fear the OP might not have the technical skill for it.
I recommend the OP just gets the EasyNet kit and goes from there. It works well.
After 3 different failed attempts at what is usually a very easy process for anyone with basic knowledge of the internet, best to keep it simple. No offense intended. The EasyNet package is as simple as punching in some numbers. Long gone are the days of configuring every stinking AmiTCP file via CED.