Ways to bathe in sauna varies between families. One neighbor does X, another Y.
Most apartment building have couple saunas in basement or ground floor. Most homes have built in sauna. Most summer (or winter cottages/villas) have either built in or separate sauna.
Some are electric heated. Some are wood heated, with chimney and some, although more rare ‘in modern times’ a traditional, chimneyless “smoke sauna”
Apartment dwellers get to have either Friday or Saturday evening “sauna shift” usually limited to 30min of steam room access.
Many house owners/renters heat up sauna 1-3 days a week.
Smoke sauna is rarely heated more than once a week. (Unless at “experience resort”, then likely heated up more often)
Most folks with modern amenities, shower first, just simple rinse with water. Then get up on the rafters, throw water on the hot rocks/stones. Enjoy the “löyly” (sauna steam). Throw more water on the kiuas (sauna stove). Get sweat pour out from the pores. If private dwelling with private backyard, step outside in fresh air (summer, winter doesn’t matter), enjoy sip of cold drink. Water or beer, cider. If there’s lake or river, plunge in. In winter, making a snow angel is invigorating.
As for vasta, that’s heretical eastern dialect word for the real name of vihta. Needs to be made of several, fresh leafed birch twigs. Should be round, at least 12” (30cm) diameter.
Soak it in warm-hot water (the leafy end) for 5-15 minutes. Can lay it on top of kiuas rocks. Not needed though. Then beat/whoop back, legs, chest, abdomen with it. (It’s soft motion, not flogging. Set back in water every now and then.
If one uses vihta, all others should too or realize the escaping air in front of the vihta app s pretty darn hot.
Lakeside summer cabin with sauna the sauna session might be several hours, relax, sweat, unwind, swim. During one’s summer vacation, the sauna at the cabin will likely get heated up every day.
One can wrap a hot dog/sausage in some aluminum foil and place it on the rocks to steam it for a after sauna snack.
Some folks like to splash a little beer on the rocks, but that’s not for me.
And, another one here will likely do it differently.