It’s to Paddy Considine's immense credit that he made Viserys so loveable among the fans.

Viewers of House of the Dragon won’t find themselves in a similar predicament as the events surrounding the second Targaryen Civil War have already been documented in full in Fire & Blood (2018).  

Fire & Blood is the historical retelling of the reign of the Targaryens as told by the fictional Archmaster Gyldayn, and it is a compressed version of all the things that make A Song of Ice and Fire so fun.