So question, do you mean one of those wig heads that's made of fabric? If so, you shouldn't use that. Those are for display only. When you use something liek hairspray, that's gonna completely ruin it. Also, I don't think you can pin to those. They are usually hard plastic with fabric around it. But even if you CAN pin to it, it's still a bad idea using a fabric one for the same reason I just said.

You can get larger foam wig heads, but they aren't usually going to match us larger headed people (I'm in the same boat as you in sizing, I'm actually 23inches lol). The foam ones are MADE to take the abuse of styling products. I understand how using a smaller wig head seems like a stupid idea on a larger wig, but that's why wigs have the hooks and loops in the back. You can tighten them, THEN put them on the wig head, and they'll stay better. Then you can pin it down to the foam head super easily. Also, buy one of these:

https://www.amazon.com/Stands-Cosmetology-Mannequin-Manikin-Training/dp/B08XK4D95Q/ref=sr_1_1_sspa?crid=3303OPQ49H684&keywords=wig+head+clip&qid=1678862935&sprefix=wig+head+clip%2Caps%2C139&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE1M0lESlc3RDQ3RDImZW5jcnlwdGVkSWQ9QTAwNzQxMjNJU0NGR0ZGNUU3R0omZW5jcnlwdGVkQWRJZD1BMDU4MDQ2NFpOVU9SUlJQMlc4OCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Or one of these if you have nowhere to clamp anything:

https://www.amazon.com/Reinforced-Mannequin-Adjustable-Cosmetology-Hairdressing/dp/B07T1HJR6L/ref=sr_1_6?crid=33OBVJ2KUW0YF&keywords=wig+head+stand&qid=1678862962&sprefix=wig+head+stan%2Caps%2C160&sr=8-6

These will keep the wig head secured while styling it. If you want a SUPER cheap stand option, go to the thrift store and find a cheap-o used tripod for cameras, that has one of those arms on it for adjustment, and make the arm face straight up, and stick that into the hole in the bottom of the wig head. Or if you can, find like a used cheap music stand or mic stand at the thrift store, and it will be basically the same as the second thing I linked, just way cheaper, and not have a ball-head for positioning the wig, but will still work.

Also, you ask about wig styling videos. I have some. I've done 2 actual tutorials, and the rest are styling in time-lapse. The more recent time lapse ones, (the last 2, specifically, and any I do in the future), I started doing voice over on them explaining what I'm doing, the rest don't have that.

My 2 tutorials:

Hime/princess/straight bangs- https://youtu.be/XO1BaI0MXiw

2 types of spikes- https://youtu.be/gnWZH6ocHO8

The rest are in this playlist. There's a lot of OTHER cosplay stuff in this playlist, so you'll have to just look through it- https://youtube.com/playlist?list=PLBP_EM4c-6mVHSlO-O2Po_JlAvMKuassH

Hope all of this helps. If you have any more questions about anything I talk about, or whatever, just reply and I'll see what I can do to answer them.