Difficult just to turn on though.
High pressing is great, when it works, but it can also leave you exposed when the opposition find the outball and leave 6 of your players wrong half of the pitch scatching their arse. You end up getting walloped.
It takes months to work on, because you can't all just press the entire match, it is impossible, you need triggers, because you need to be pressing at the same time, no good if two of your players are high pressing and the others haven't gone leaving an easy pass for the opposition, all you end up doing is wasting your energy. Takes time to finesse. You can't just do in two weeks.
Allardyce will improve next season, given the chance, but if you are hell bent on getting rid of him, and want someone a bit more progressive I would go for Eddie Howe, who can play the pressing game, plays attractive football, is working miracles at Bounemouth, has PL experience, can adapt when things are going south (as it looked like they might be for a few months this year), still only 40, and is the best young English talent about by far.
If he was called Eduardo Howesinho, you'd all be demanding Everton get him, before someone else does! I would get him!