Welcome to the forums!
The foundations of trust are established by spending time with your budgies and by making an initial connection to them and this is done by spending time sitting close to their cage and talking to them in a calm, positive, encouraging and reassuring way. By doing so, your budgies will increasingly get used to your presence and voice and in due time they will realize that you are not a threat.
Once one or both of your budgies show signs of being more receptive to you when interacting with them, you can slowly place your hand on the cage to offer your budgies a little treat to eat.
When it comes to taming and solidifying the bond, it's important to work on a consistent manner and to use positive reinforcement techniques.
You can keep short 20 - 30 minutes sessions for 2 or 3 times per day depending on your availability.
While it can be more challenging to tame 2 birds at the same time, it's not impossible to do so and this is even for a pet bird who has more of a shy/nervous personality. With continued work, your budgies can at the very least become finger tamed.
You will find a lot of good in depth information on the sticky threads located at the top of the Taming and Bonding page, so you can check them out.
You can start with these:
Best of luck with your budgies!