I can use my own icons instead of stock ones to save time when creating logos for clients! It's easy enough that it doesn't require much knowledge or customization from me once installed / configured properly (which isn't always straightforward). Sometimes there are problems with rendering certain icon fonts which causes them not display correctly until you restart your browser - sometimes this is fixed by closing all open tabs & browsing away but other times they're still broken even after doing so. If possible try using different font formats such as @font-face vs web safe Fonts like TTF/OTF etc; however if those don't work then maybe consider purchasing custom made SVGs? This saves loads of money over paying someone else who will charge hundreds just because their software has been updated since 2015.