@skoski not quite sure which instructions you are using and/or what phone you have. Yes you can safely proceed past this point if you do not have a SIM. Let us know what exact phone you have....on an iPhone the AXXXX number will help us.
=== Update (10/01/2016) ===
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@skoski the guide you are using is for the GSM Model A1332 for your CDMA A1349 use [https://www.ifixit.com/Guide/iPhone+4+Verizon+Home+Button+Replacement/5062|this guide]
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@skoski the guide you are using is for the GSM Model A1332 for your CDMA A1349 use [guide|5062|this guide]. that explains why you had different screws and why it looked different:-)
@skoski not quite sure which instructions you are using and/or what phone you have. Yes you can safely proceed past this point if you do not have a SIM. Let us know what exact phone you have....on an iPhone the AXXXX number will help us.
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=== Update (10/01/2016) ===
+
+
@skoski the guide you are using is for the GSM Model A1332 for your CDMA A1349 use [https://www.ifixit.com/Guide/iPhone+4+Verizon+Home+Button+Replacement/5062|this guide]
@skoski not quite sure which instructions you are using and/or what phone you have. Yes you can safely proceed past this point if you do not have a SIM. Let us know what exact phone you have....on an iPhone the AXXXX number will help us.