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You don't have an engineer because you chose self install!!
There is no such thing as an 'Infinity socket' any socket with a built in or separate plug-in filter will suffice. Why do you need a 'red VDSL cable' , the HH5 just plugs into the filter exactly the same as it does for ADSL
Openreach don't bother with the fancy Infinity faceplates any more unless it's a very flaky line with borderline connectivity. It turns out that a standard ADSL microfilter, as supplied with the Home Hub, works perfectly well for VDSL as well.