The first engine change I did was on a Austin Princess. It took me a day to get it out and a day to put the replacement in. My only cock-up was I forgot to reconnect the electric fan, a mistake I discovered while sat in traffic on the M5 on our way to Cornwall. Ive done about half a dozen engines since, the last one was a Lancia Beta coupe, that also took two days but it included getting the replacement engine out of the donor car. I haven't gotten faster at it, just more careful.
Col