This was my first time using the LBMS shield transfers at 28mm scale. It's a slightly different job than applying them to my 1/72 Romans!
I've found that, for the most part, the hole punched in the centre of the transfers is a touch too small and needs to be fiddled with both before and after application. I tried stretching it, cutting slits in it, or 'scraping' it off the shield boss after application, with mixed results.
Also, some of the transfers are a little large so you have to cut them just a fraction smaller. If you make them too large then the edge of the transfer lays on the rim of the shield, and gives a visible ridge effect which I had to cover over on some models with liquid greenstuff before painting. Also, micro-sol didn't appear to do anything to these transfers. I hoped it would 'liquify' them like it does to waterslide transfers and let them mold to the shape of the shield, but it didn't happen for me.
My method was:
Paint shield white.
Cut out transfer and add slits to the hole for the boss to make it easier to adjust the transfer after application.
Apply transfer, wet, wait for 10 seconds, then remove.
Fiddle with shield hole as required. Usually this involves scraping the transfer away from the boss with a craft knife.
Leave overnight to dry.
Fix any shield rims that are marred by overlapping transfers
Paint/weather/shade as needed, including shield rims and bosses
Apply gloss varnish
Apply matt varnish
Finished.
If one had a steady hand and was able to paint these lovely patterns freehand, then that would be much quicker and less stressful. But sadly I don't have that steady hand and these are labour intensive, but do look lovely. I did have some issues with 'ballooning' around the shield boss because the hole wasn't big enough, and this took some time to deal with, but there's no longer a noticeable effect.