No idea how much this will help, but I studied Russian at university and have dabbled in Koine Greek, Arabic and Hebrew, so I will share my experiences!
First things first: don't be scared of the script. It may be too late since I imagine you started already, but it bears repeating. These things take time to get used to, but alternate alphabets are not as difficult as they often appear as first. (I've often had to correct people and tell them that Cyrillic is by far and away the easiest thing about Russian
As far as I know Devanagari is a proper alphabet that represents the sounds of the languages the same way the Roman alphabet represents the sounds of many European languages. This might sound obvious, but it isn't always the case - with Hebrew, you have to know a certain amount of the language to be able to make intelligent guesses of the vowels, which in everyday life are not usually included in the writing. The fact that the Devanagari script will actually tell you how to say a word is a bonus, believe me
Reading and writing it: the obvious, practise a lot. The more practice, the more fluent and comfortable it will become.
When I was just starting to learn Cyrillic, the examples in the books were often brand names that had been rendered in such a way that the brand was familiar even though the letters were not, or words that had been adopted into Russian without being modified, so once one had figured out that it sounded like "corn flakes" or "hamburger", meaning became obvious. The next step also seemed obvious: figuring out how to write my own name and others' names in the script, even writing English sentences in Cyrillic, copying out Russian dialogue from our textbooks, etc.
It's also helpful to learn to recognise a few common and useful words - if you can spot the "ands" and "buts" in the text, it gives you something to hold on to, and it's iust so nice to spot something and realise you do know a little, even if at first it is only a little.
I do personally think that getting comfortable with writing it is really important. Obviously from the standpoint of writing anything in a given language, but also I think it is a really good way of getting the script into your head. Jot notes to yourself in it, challenge yourself to find really short pieces of the script (say, Hindi advertisements) and work out what the letters are and how you'd say it, even if you don't know what the words actually mean.
Just IMO, there's a confidence factor with being able to decipher and reproduce an alphabet that at first just looked like pretty squiggles that is a real boost for one's belief that the task is actually doable. I suppose it's a little like feeling you've learned a new code or secret, and it may seem silly but it really does feel good to look at what was once a bunch of curls and wibbles and be able to see sounds and words in there. With a script that seems so foreign, all progress and all achievements are worth celebrating and giving yourself a pat on the back over, even if it's just seeing Coca Cola in the script and being able to sound out those words.
I have a feeling I'm probably forgetting some really obvious tricks, if I think of anything else handy then I'll let you know. I hope it goes/is going really well and you're enjoying it and finding it less intimidating than at first. Devanagari is on my list of "scripts I must learn", as a language/alphabet enthusiast, I am quite jealous! Good luck and have fun