If you have ever thought of electrical panel upgrade as a DIY project, then my suggestion would be to rethink about it.
Amateur or DIY wiring is not only dangerous but can be far more costly to repair in the future.
Electrical work also is not an area where you’ll benefit from hiring the cheapest provider. There are many ways to cut corners with electrical work, and most consumers won’t know the difference. That’s why it’s important to choose your contractor based on referrals, using resources. Get plenty of references, and don’t make your decision based on price alone. Safety of your loved ones come first.