Just got done adjusting my valves for the first time yesterday and they were tight when I was done- did the half turn thing. Havent drove it yet but I went to check them today and some are a little loose ( I can wiggle them a little bit side to side but not up and down). Can I just give them all another quarter turn form where theyre at or do i gotta start over?

 

Sideways motion is normal.

 

Hydraulic lifter leakdown will make them feel loose again. Don't readjust unless they clatter after the engine is fired up.