The general rule of thumb is that you must maintain an “arms length” from any assets owned by your plan. Any direct work done by you to the property will be seen as providing benefit to the plan, and results in a violation of IRS rules.
We recommend hiring a property manager to perform repairs on your properties. If you're an account owner using a Rocket Dollar Self-Directed IRA with an LLC you can hire the property manager, arrange payment from your LLC business or trust bank account.
You can even use a debit card connected to the LLC business bank account to make payments associated with the property such as taxes, insurance, and maintenance.