HI! Welcome to SoCal! I did Wilson two weeks ago as a day hike, and it’s totally do-able (wouldn’t call it easy.. :))
I’m planning on doing it again with my 10 year old daughter.
First day- 3.2 Miles Chantry up Gabrieleno Trail past the waterfall and to Spruce Grove Campsite. (You can also rent a cabin at Sturtevant camp).
Second day- 7.8 miles Spruce Grove to Observatory- lunch at the top. Hike down to Mt Wilson trail to Winter Creek Trail to Hogee’s for night 2
Third day- 2 or 3 miles Hogee’s to Chantry. Either by Winter Creek Trail or Lower WCT
You could totally go from Spruce Grove to the Summit and back to Chantry in a day.