Kind of an odd little bonus to re-spec a character from wizard into a multi-class wizard/spellcaster: you retain all the wizard spells you learned from scrolls.
Example: Start with wizard level 6 who chose Fireball at level up and then learned Fly from a scroll during gameplay. Go to Withers, re-spec the character to Bard 5/Wizard 1. Now you get to prepare only two wizard spells, but ... the Fly spell is still in your wizard book and you can cast it using a level 3 slot. The fireball spell is gone, however, since that was selected and not learned from a scroll in this example.
I am level 8 in my game now, and I am still learning what I do and do not like. I like dual wielding hand-crossbows quite a bit. Fireball is great, but glyph of warding is even better in some ways. More than one Misty Step is always good to have (see above). Concentration type spells are a bit frustrating, but bonus action spells (Spirit Weapon, Healing Word) and reaction spells (Shield) are fantastic.
