Going there by yourself isn't hard. I usually go there two times a year and acquire the items i bought meself. Just a few pointers which others have already pointed out:

1- wear appropriately

2-bring cash, although now they accept QR pay too (TnG not possible last Feb I was there, maybe duitnow can?) but still, better be safe than sorry. Nearest ATM is several blocks away at the other side of the road, the inactive food court I think

3-the payment + whatever charges they think in front of you at the time is 10%, or slightly more. This is a bit of an odd one: sometimes they charge the nett price of the item you shipped in, sometimes plus shipping. A 2.5k collectible figurine will be 250 or 300+ depending on the officer working that day.

4-the thing becomes a multiple day affair IF your item in question requires SIRIM certification. But SIRIM can be done online and easy (paid rm100 for linux device on 2022, paid rm100 for an obscure windows handheld, last year)