I typically recommend connecting the antennas before inserting the new WiFi card into the slot, since that way you can pinch the antennas down onto the card's connectors by placing your thumb over the antenna and your index finger on the underside of the WiFi card directly under its antenna connector. If eyesight is a concern though, the tiny antenna connectors can be tricky to deal with, and it's important to get them firmly connected, since a loose antenna connection can drastically reduce WiFi performance. In terms of performing the swap, yes it's very easy and if you go to, you can find your Owner's Manual, which contains step-by-step guides complete with diagram drawings for how to remove and reinstall every component of the system - or here is a direct link.
My guess is that the issue is that the Dell 1504 doesn't support the Wi-Fi Direct standard, which essentially allows a wireless adapter to establish a point-to-point WiFi connection for things like Miracast while also remaining connected to a router for Internet access.
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