The P30 is not officially supported in terms of converting from DA/SA to LEM, and the reverse is impossible. The HK45 can be converted to LEM.
As mentioned, both models can be found in LEM variants. You have to look for dealers advertising them as such.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness