Patience is the key. The home made collimater will work but so does the ground glass. Your primary aim is for infinity & all else will fall into place.
If you get frustrated enough let me know & you can send it to me & I'll set it up for you. One of my earlier incarnations was as a camera technician. If you need a rec talk to Joeyk49. All it'll cost is shipping & a donation to APUG. $$ is up to you.