I definitely think you should spend as much time with them as you can Lainey01 just to see what the routine is and how things are done. I don't think that not having your own baby is too much of a handicap, when I took over my grandson it was nearly 30 years since I had had one and things had changed so much I had to relearn almost everything. Different nappies, different bottles, different ways of mixing formula, different ideas about weaning, complicated push chairs and car seats instead of throwing them on the back seat in a carry cot!
Mine was enormous fun and I'm sure your's will be too!
Good Morning Tuesday 23rd April St Georges Day