Looking through the Guides section of the site there is this guide: https://www.lotus7.club/guides/how-guides/removing-k-series-engine
For me, who will be doing this for the first time, a really straight forward step by step guide is needed, there seems to be a bit of prior knowledge in that account. Of course the notes are most important when putting the thing back. I could probably get it out but getting it wrong as you put it back will hurt more.
Surely we need a comprehensive guide?
BTW: I will be taking it out leaving the gearbox in place (by preference and in respect of the height of the garage). My engine, in the 21 (which should make no difference) has an Apollo tank, so specific side notes on that will be needed. I can add: "remove the bonnet and store carefully" as the first and "replace the bonnet" as the last move of the sequence.