156 knocking bottom end

Hi and welcome

No different to any other IC engine :)

Remove engine from car (far easier than trying to do it insitu).

Remove sump.

Remove big ends and main caps and look for wear/grooves/damage on the crank. Ideally, remove the crank and check journals for wear.

If no damage, simply rebuild engine with new gaskets and shells.

If there is damage and a regrind will solve it (and there are undersized shells available - they aren't for my son's 33), remove crank and get it done. Rebuild engine.
 
IF you have never done any mechanical work then I would suggest you buy a workshop manual and read it thoroughly and understand it before you start spinning the spanners
Joining an Alfa club would be helpful.
 

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