0g to 00g stretching advice?

I have been at 0g (tunnels, not tapers) for about two months or so now and I just bought 00g silicone tunnels, but I am having the hardest time getting them in. Also, the silicone tunnels I bought are from spencers and feel thick and are flared st both ends so when I pinch them it doesn’t help much. Any advice or help to get them in?