I need R-12 with dye. My system does not have a R134 retrofit kit on it.

Autozone did not have any R12 substitutes. Bought 3 cans of FREEZE 12 at Pep Boys. They keep this stuff in the back. Not out front with all the R134 derivitives. Some warnings from the can:
1. Recover residual R-12 in A/C system.
2. Replace any refigerant oil lost during recovery process.
3. Install new service fittings (low/high side).
4. Deep evacuate & recharge A/C system with 10% less FREEZE 12.
5. FOR USE BY QUALIFIED PERSONNEL ONLY.

Are any of these mandatory to do? I just want the A/C to work for the summer.