Most years you'll still have plenty of snow about. Hopefully not too much (keep an eye on the SAIS conditions if there's still lots of snow
https://www.sais.gov.uk/)
As mentioned, Buachaille Etive Beg is a good hill, relatively easy. However, still take it steady, its good to practice things like ice axe/crampon skills (walking with them, and emergency braking of falls) on a nice safe slope low down.
Before you go, perhaps practice your navigation skills in low visibility, these are arguably the most important part of going to the winter hills.
There's a saying that "there is no such thing as Scottish Winter Hillwalking, only Scottish Winter Mountaineering", so do take it one step at a time, but given that approach, you'll have a wonderful time.