You could go to a gliding club, where 2g (60 degree) turns would be quite normal in a narrow thermal.
The procedure in my 18m glider is a little different from a powered a/c:
1. Increase airspeed to 55 kt (50 kt is possible, but might make the handling a little sluggish). More likely, pull back from 75 kt to 55 kt as I climb into the turn.
2. Full into turn rudder while banking to 60 degrees.
3. Increased back pressure on stick (nearly to backstop) as bank increases.
4. Once in the turn reduce rudder - a little out of turn rudder might even be required to maintain balanced flight.
At this point I should be a comfortable 2-5 kt above stall speed.
To maintain height in this turn I would need to be in a 2-3kt thermal - but if I turned this tightly I'd hope it was 4-10 kts!