Change animation after picking up weapon

Development Character & Animation
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1

Hi,
I have been trying to have my character hold the gun at hip when a gun is being picked up. The pick-up mechanism along with many other features were implemented using C++ and I am not really familiar with Blue Print.
What I want to do is to change from this:

T
T478×776 279 KB

To this, once I pick up a weapon:

idle
idle617×831 333 KB

The codes for picking up weapon and firing:

void APlayerCharacter::Interact()
{
	TArray<AActor*> Guns;
	this->GetOverlappingActors(Guns);
	for (int i = 0; i < Guns.Num(); i++)
	{
		AGun* const GunItems = Cast<AGun>(Guns[i]);
		if (GunItems && !GunItems->IsPendingKill() && GunItems->GetActive() && GunItems->ActorHasTag("Pickable"))
		{
			GunItems->Interacted();
			GunItems->AttachToComponent(GetMesh(), FAttachmentTransformRules::SnapToTargetIncludingScale, FName("HoldWeapon"));
			bGun = true;
		}
	}
}

void APlayerCharacter::Shoot()
{
	if (bGun == true)
	{
		Gun->Fire();
	}
}

What might be some useful functions (c++ or blue print) that can be used in this case?

Thx!