https://grapheneos.org/install/web is easy to use and GrapheneOS has broad app compatibility these days via sandboxed Play services (https://grapheneos.org/usage#sandboxed-play-services). We're working on making the out-of-the-box experience nicer via a first party app repository and client which can be used to bootstrap installing other app stores too. There are over 6400 users in the GrapheneOS Matrix room with many experienced people always around at any time of day that are willing to spend lots of time helping new users.