I tried out the wheel strategy since Jan this year. In order not to get margin calls, I used no leverage at all. So I sell cash-secured puts, with enough cash in my account to pick up the shares if I get assigned. When I was assigned the shares, I turned around and sold covered calls. This is supposed to be a safe strategy because no leverage is involved. However, I have to be mindful of another variable called excess liquidity. The platform will send me an alert if my excess liquidity falls below 16%, notifying me that I am in danger of being liquidated. Yes, so always keep enough cash in your account so that your excess liquidity is above 16%. And enjoy your options trading journey!